Re: [Tutor] What Editori?
I use and love Pyscripter for Windows. I guess I am used to the Delphi IDE. Mike On Tue, Feb 23, 2010 at 11:24 AM, Giorgio wrote: > Hi All, > what text-editor do you use for python? > I've always used kate/nano on Linux and Notepad++/PSPad on Win. Today i've > installed portablepython to my pendrive, and found pyscripter in that. It's > nice! > Do you think it's a good editor? Do you know other names? > Giorgio > > -- > -- > AnotherNetFellow > Email: anothernetfel...@gmail.com > > ___ > Tutor maillist - tu...@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] string formatting
I'm in the process of learning python and migrating away from bash scripting. I'm in the process of converting my bash scripts that essentially ssh to another host via shared keys, execute commands remotely, and exit. To do this I started using paramiko but eventually decided to do it w/ subprocess since I am more familiar with that as a result of me converting other scripts. This is what I'm currently working on, the purpose of this is to ssh into another machine, make a tarball of dumped .sql files, save the tarball with the result of timestamp() as the naming convention, then it will eventually clean it up based on file age: http://dpaste.com/817874/ This is the result after executing the script: rev@omega:~/code/beavis/test$ ls bleh1.sql bleh2.sql bleh3.sql ssh-jobs.py rev@omega:~/code/beavis/test$ ./ssh-jobs.py tar: Removing leading `/' from member names /home/rev/code/beavis/test/bleh2.sql /home/rev/code/beavis/test/bleh3.sql tar: /home/rev/code/beavis/test/24.10.2012: Cannot stat: No such file or directory tar: 15\:06\:52.tgz: Cannot stat: No such file or directory tar: Exiting with failure status due to previous errors rev@omega:~/code/beavis/test$ As you can see it looks like its having issues with the way I'm using timestamp() for string formatting, as far as I can tell it is not a tar specific problem? Any help/insight on this would be greatly appreciated. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] unittest not working
I'm trying to unit test a self-built regular expression processor for an
assignment. I'm trying to set up unit tests for the package, but it's not
executing them. This is my first time trying to use the unittest module, so
I'm sure I'm missing something, I'm just not sure what. I even put a test
case in there I knew would fail just to try it.
Unit Test code:
import unittest
from regex import regexp
class RegexTest(unittest.TestCase):
def fail_test(self):
self.assertEqual(1, 2)
def basic_test(self):
self.assertEqual(regexp('Hello', 'Goodbye'), '')
self.assertEqual(regexp('hello', 'ello'), 'ello')
with self.assertRaises(SyntaxError):
regexp('hello', 'he)')
if __name__ == '__main__':
unittest.main()
Output:
>>>
--
Ran 0 tests in 0.000s
OK
Exit code: False
>>>
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[Tutor] Better way to insert items into a list
Hello everyone,
I was wondering if someone could show me a better way to achieve what
I am trying to do. Here is my test code:
d=[]
c="00"
a="A,B,C,D"
b=a.split(',')
for item in b:
d.append(item)
d.append(c)
print tuple(d)
Basically what I want to end up with is a tuple that looks like this:
("A","00","B","00","C","00")...
As you can see I want to insert 00 in-between each element in the
list. I believe this could be done using a list comprehension?
I realize I achieved my goal, but I was wondering what other
alternates could be done to achieve the same results.
Thanks in advance for your assistance.
Mike.
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Re: [Tutor] Better way to insert items into a list
Thank you. Works well. Mike On Sat, Dec 8, 2012 at 4:18 PM, bob gailer wrote: > tuple(sum([list(x) for x in zip(a,[c]*len(a))],[])) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] symlinking dirs with spaces
Hi all,
I wrote a cli script for syncing my music to a USB mass storage device
like a phone etc. all it does is it creates a symlink in a dir to
whatever folder i pass as an argument via ./addsync DIR . My problem is
i'm having trouble dealing with directories with spaces. when using
os.symlink I get the error below and when using subprocess it creates
individual directories for the words separated by white space. any help
would be appreciated on how to approach this.thanks!
This is the script:
#!/usr/bin/env python
import os
from sys import argv
import subprocess
script, media = argv
# This is the directory you will sync the symbolic links from, to the
device.
loadDir = "/opt/data/music/load/"
# This is the destination folder, whatever folder the device is mounted to.
destDir = "/media/MOT_"
# Get the current working directory
origDir = os.getcwd()
# Glob the current working directory and the "media" argument together
# to form a full file path
origFul = os.path.join('%s' % origDir, '%s' % media)
linkDir = "ln -s %s %s" % (origFul, loadDir)
# Command to sync if media == "push"
syncCom = "rsync -avzL %s %s" % (loadDir, destDir)
def link():
print "Adding %s to %s..." % (origFul, loadDir)
os.symlink('origFul', 'media')
#subprocess.call(linkDir, shell=True)
def sync():
print "Syncing the contents of %s to %s" % (loadDir, destDir)
subprocess.call(syncCom, shell=True)
if media == "push":
sync()
else:
link()
rev@sheridan:~/code$ ./addsync SPACES\ TEST/
Adding /home/rev/code/SPACES TEST/ to /opt/data/music/load/...
Traceback (most recent call last):
File "./addsync", line 37, in
link()
File "./addsync", line 27, in link
os.symlink('origFul', 'media')
OSError: [Errno 17] File exists
rev@sheridan:~/code$ ls -lh /opt/data/music/load/
total 4.0K
-rwxrwxr-x 1 rev rev 225 Apr 11 09:26 addsync
lrwxrwxrwx 1 rev rev 34 Oct 29 20:30 CCR - Best of CCR ->
../classic_rock/CCR - Best of CCR/
rev@sheridan:~/code$
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Re: [Tutor] symlinking dirs with spaces
On 04/28/2013 12:43 PM, eryksun wrote:
On Sat, Apr 27, 2013 at 9:51 PM, Dave Angel wrote:
And another little-known fact -- NTFS supports hard links, or at least it
did in 1995, on NT 3.5 As I recall, there wasn't support at the cmd prompt,
but you could create them with system calls.
NTFS has always supported hard links as additional $FILE_NAME
attributes in the MFT file record, but it was primarily meant for the
POSIX subsystem. I did find a Win32 solution for NT 3.x, which may be
what you're recalling. It requires 3 calls to BackupWrite in order to
write a link (i.e. a $FILE_NAME attribute) to an existing file record.
Apparently this was documented by Microsoft circa '96, but the
original article no longer exists online. For an example see
CreateHardLinkNt4() here:
http://cpansearch.perl.org/src/AUDREYT/Win32-Hardlink-0.11/lnw.cpp
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My apologies for not responding, Dave's insight resolved my problem
instantly. I am now having problems with a function I've made that is
supposed to run a find on the media root dir and symlink anything that
was downloaded within a specific amount of days, here is the code:
#!/usr/bin/env python
import os
from sys import argv
import subprocess
script, media = argv
# This is the directory you will sync the symbolic links from, to the
device.
loadDir = "/opt/data/music/load/"
# Root dir of the media
musicDir = "/opt/data/music"
# This is the destination folder, whatever folder the device is mounted to.
destDir = "/media/rev/MOT"
# Get the current working directory
origDir = os.getcwd()
# Glob the current working directory and the "media" argument together
# to form a full file path
origFul = os.path.join('%s' % origDir, '%s' % media)
linkDir = ['ln', '-s', '%s' % origFul, '%s' % loadDir]
# Command to sync if media == "push"
syncCom = "rsync -avzL %s %s" % (loadDir, destDir)
def sync_new():
durFind = raw_input("Enter the duration of time in days you want to
link")
durFind = int(durFind)
fileExcl = "*torrent*"
linkNew = ['find', '%s' % musicDir, '-maxdepth 2', '-mtime %s' %
durFind, '-not', '-name', '%s' % fileExcl, '-exec addsync {} \;']
subprocess.call(linkNew)
def link():
print "Adding %s to %s..." % (origFul, loadDir)
subprocess.call(linkDir)
def sync():
print "Syncing the contents of %s to %s" % (loadDir, destDir)
subprocess.call(syncCom, shell=True)
if media == "push":
sync()
elif media == "pushnew":
sync_new()
else:
link()
Running the script with the pushnew argument results in the following
error from find:
find: unknown predicate `-maxdepth 2'
I'm thinking this is also related to my usage of subprocess? I just
started carving this out right now so I'm still debugging but if anyone
sees anything obvious I would appreciate it.
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Re: [Tutor] symlinking dirs with spaces
On 04/28/2013 07:37 PM, Dave Angel wrote:
On 04/28/2013 08:17 PM, mike wrote:
def sync_new():
durFind = raw_input("Enter the duration of time in days you want to
link")
durFind = int(durFind)
fileExcl = "*torrent*"
linkNew = ['find', '%s' % musicDir, '-maxdepth 2', '-mtime %s' %
durFind, '-not', '-name', '%s' % fileExcl, '-exec addsync {} \;']
subprocess.call(linkNew)
Running the script with the pushnew argument results in the following
error from find:
find: unknown predicate `-maxdepth 2'
I'm thinking this is also related to my usage of subprocess? I just
started carving this out right now so I'm still debugging but if anyone
sees anything obvious I would appreciate it.
Your linkNew list doesn't have separate items for each argument to find.
The first example is that "-maxdepth" and "2" should be separate list
items. The only other spot I notice is the -exec item, which should be
distinct from the following.
I don't understand why you have things like '%s' % musicDir, when
musicDir is already a string. That list item should be just musicDir,
which would read much better.
I separated the maxdepth argument with '-maxdepth', '2', seems and now
it is focusing on the exec portion which i'm trying to figure out how to
separate and make it sane as far as single/double quotes go.
Can you elaborate on what you mean regarding the musicDir variable? I
have a loadDir which specifies where the symlinks reside but the actual
root of the media directory is /opt/data/music and it's organized via
directories based on genres which is why I am specifying musicDir
instead of loadDir for this function
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Re: [Tutor] symlinking dirs with spaces
On 04/28/2013 08:12 PM, Steven D'Aprano wrote:
On 29/04/13 10:54, mike wrote:
Can you elaborate on what you mean regarding the musicDir variable? I
have a loadDir which specifies where the symlinks reside but the
actual root of the media directory is /opt/data/music and it's
organized via directories based on genres which is why I am specifying
musicDir instead of loadDir for this function
Your command, in part, looks like this:
linkNew = ['find', '%s' % musicDir, ...]
The first item is "find", the name of the command. The second item takes
a variable which is already a string, musicDir, and turns it into a
string using '%s' % musicDir. But it's already a string, so that's just
double-handling. Instead, write this:
linkNew = ['find', musicDir, ...]
Ahhh I see the redundancy now, the function seems satisfied with the
linkNew list with the exception of how how I'm using '-exec ...'
I get the following when executing:
rev@sheridan:~/code$ ./addsync pushnew
Enter the duration of time in days you want to link
-5
find: missing argument to `-exec'
rev@sheridan:~/code$
this is the currently working list:
linkNew = ['find', 'musicDir', '-maxdepth', '2', '-mtime', '%s' %
durFind, '-not', '-name', '%s' % fileExcl, '-exec', 'addsync {} \;']
Is this an example where I want to be calling this while emulating a shell?
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Re: [Tutor] symlinking dirs with spaces
On 04/28/2013 08:59 PM, Dave Angel wrote:
On 04/28/2013 08:54 PM, mike wrote:
On 04/28/2013 07:37 PM, Dave Angel wrote:
On 04/28/2013 08:17 PM, mike wrote:
def sync_new():
durFind = raw_input("Enter the duration of time in days you
want to
link")
durFind = int(durFind)
fileExcl = "*torrent*"
linkNew = ['find', '%s' % musicDir, '-maxdepth 2', '-mtime %s' %
durFind, '-not', '-name', '%s' % fileExcl, '-exec addsync {} \;']
subprocess.call(linkNew)
Running the script with the pushnew argument results in the following
error from find:
find: unknown predicate `-maxdepth 2'
I'm thinking this is also related to my usage of subprocess? I just
started carving this out right now so I'm still debugging but if anyone
sees anything obvious I would appreciate it.
Your linkNew list doesn't have separate items for each argument to find.
The first example is that "-maxdepth" and "2" should be separate list
items. The only other spot I notice is the -exec item, which should be
distinct from the following.
I don't understand why you have things like '%s' % musicDir, when
musicDir is already a string. That list item should be just musicDir,
which would read much better.
I separated the maxdepth argument with '-maxdepth', '2', seems and now
it is focusing on the exec portion which i'm trying to figure out how to
separate and make it sane as far as single/double quotes go.
If I were sure enough about the syntax to find (I only use -exec about
once a year, and have to look it up each time), I could be explicit.
But if you want -exec addsync {}
you should be using 3 different list items.
I don't think the \; means anything useful since you're not using the
shell. But if find needs a semicolon there somehow, I might try just ";"
Could you show us exactly what the find command would look like if you
were executing it at the bash shell prompt?
Can you elaborate on what you mean regarding the musicDir variable? I
have a loadDir which specifies where the symlinks reside but the actual
root of the media directory is /opt/data/music and it's organized via
directories based on genres which is why I am specifying musicDir
instead of loadDir for this function
Simple. Since musicDir is a string,
"%s" % musicDir
is a verbose way of saying
musicDir
Likewise for fileexecl. Neither is an error, just confusing.
I didn't see your response dave, this would be the full syntax:
find /opt/data/music -maxdepth 2 -mtime -5 -not -name "*torrent*" -exec
addsync {} \;
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Re: [Tutor] Python 2.4 IDLE Windows 2000
That rooted out the problem. A while ago, I changed the colors to kind of match my VIM color theme(ps_color). When I did idlelib.PyShell.main(), IDLE came up with my custom color theme. However, there was a bunch of warnings about my theme. From IDLE, I deleted the theme. Now IDLE will launch normally. I'll set up the color theme later. Maybe older color themes aren't compatible with the newer IDLE? The color theme must have been laying around. I didn't brute force it in or anything like that. I appreciate the help. Mike Danny Yoo wrote: Yowza; that's some bug. Danny, do you happen to know the bug number? I can't find it on sourceforge. It's been like that since 2.3 as far as I know. It generates a connection to localhost to run code in a separate environment. Hi Mike, I wish I knew what the problem was in better detail. IDLE is a part of the Standard Library, so it's actually possible to try turning on individual pieces of it, one after the other. Maybe that will help us debug what's going on. Start up your console version of Python, and try: ### import idlelib.PyShell idlelib.PyShell.main() ### That should start IDLE up manually, and if anything bad happens, at least we should see some errors pop up that will help us debug the situation. Let's make sure this doesn't fail quietly. *grin* Good luck to you! ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
[Tutor] Socket events and wxPython events?
To learn Python, I'm adapting a board game to a network based games with server and clients. It took a while, but with a little help, I've learned about wxPython, wxglade, SPE so that I now have a prototype GUI up and running. Now to get the network part up and running... The network will be sending commands, responses, and random queries. I'm thinking about 3 approaches, but rather than beat my head against the wall, I was hoping to find out if any of these are workable: 1) use sockets lib. Do socket send/recv generate any kind of event with an event id that can used with the wxPython window events? That is, I want to just sit and receive events such as OnPaint, OnButton, in the same loop as I receive "OnReceiveSocket" (or whatever it might be called). 2) create a separate thread which does a select then sends a wxPython compatible event which can be intermixed with OnPaint, etc (similar to option 1) 3) use SocketServer. I noticed the SocketServer class refers to "request handler class" and "handle" functions. Do these generate any events which are wxPython compatible You probably noticed I'm a little confused about what a wxPython compatible event is. I'm not sure if these events and their event handling are part of Python or something added by and unique to wxPython. Thanks, Mike ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python 2.4 IDLE Windows 2000
Danny Yoo wrote: On Fri, 3 Dec 2004, Mike Hansen wrote: That rooted out the problem. A while ago, I changed the colors to kind of match my VIM color theme(ps_color). When I did idlelib.PyShell.main(), IDLE came up with my custom color theme. However, there was a bunch of warnings about my theme. From IDLE, I deleted the theme. Now IDLE will launch normally. I'll set up the color theme later. Maybe older color themes aren't compatible with the newer IDLE? The color theme must have been laying around. I didn't brute force it in or anything like that. Hi Mike, Ah, whew, I'm glad that actually worked. *grin* The information about the color theme problem is valuable to know: can you send a message to the IDLE developers with a summary of the situation? It's possible that a lot of other folks might be running into a similar startup problem. Let's make sure that no one else has to go through hoops to get IDLE working again. The IDLE development list is: http://mail.python.org/mailman/listinfo/idle-dev Good luck to you! Hi Danny, I put in a bug report on the python sourceforge site. The idle-dev mail list didn't seem appropriate. It seems like a mail list for idle developers to discuss the IDLE development plan not for users to post about bugs. Thanks again for your help on this issue. Mike ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
[Tutor] Variable declaration
Perl has "use strict;" to force variable declaration. My insane Perl loving co-workers think it's evil that Python doesn't have variable declaration. =) What are some of the reasons/arguments on why Python doesn't need variable declaration? I've gotten around it in Python by using Pyflakes to check my code and catch those silly mis-spelling of a variable. Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tutor list as pair progamming plush toy
> -Original Message- > From: tutor-bounces+mike.hansen=atmel@python.org > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Mac Ryan > Sent: Friday, February 12, 2010 8:33 AM > To: tutor@python.org > Subject: [Tutor] Tutor list as pair progamming plush toy > > Have you ever got that piece of advice about - when you have > stuck on a > bug you seem unable to track - getting a plush toy to whom you explain > your code? (This is of course a workaround if you do not have a fellow > developer to help you out). > > Well... I found out this advice kind of works for me, with the notable > difference that my plush toy is this mailing list. It works so > wonderfully that indeed is several months I do not post any message: > whenever I get stuck, I begin to write a message to the list, > and in the > process of explaining what is the intended behaviour and outcome of my > code, I systematically find the bug by myself. > > I know - this is slightly OT for the list - but I thought to share as > maybe this is a "hidden benefit" the list is bringing to a few people > without the tutors even knowing it. > > Does anybody else experience the same? > > Cheers, :) > Mac. > This kind of sounds like the rubber duck method of debugging. http://lists.ethernal.org/oldarchives/cantlug-0211/msg00174.html Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] The Order of Imports and install order of modules andother matters (XP vs W7, ...)
> -Original Message- > From: tutor-bounces+mike.hansen=atmel@python.org > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Kent Johnson > Sent: Saturday, February 13, 2010 8:06 AM > To: Wayne Watson > Cc: Tutor Python > Subject: Re: [Tutor] The Order of Imports and install order > of modules andother matters (XP vs W7, ...) > > On Fri, Feb 12, 2010 at 10:55 PM, Wayne Watson > wrote: > > There seems to be something of a general consensus in > ordering import > > statements. Something like standard library imports first. > When using tools > > like matlablib or tkinter (maybe), must one keep an order > among the relevant > > imports? > > I don't know if there is a general consensus but what I like to do is > standard library imports > third-party library imports > application-specific imports > > Within each group I tend to group "import x" imports before "from x > import y" imports and alphabetize by module name. I'm not strict about > that though. > This make me wonder. Is there a document or web site that has Python Best Practices? Something along the lines of the Perl Best Practices book, but probably shorter. =) Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] The Order of Imports and install order of modules andother matters (XP vs W7, ...)
From: sri...@gmail.com [mailto:sri...@gmail.com] On Behalf Of Wayne Werner Sent: Tuesday, February 16, 2010 1:07 PM To: Hansen, Mike Cc: Tutor Python Subject: Re: [Tutor] The Order of Imports and install order of modules andother matters (XP vs W7, ...) http://www.python.org/dev/peps/pep-0008/ This make me wonder. Is there a document or web site that has Python Best Practices? Something along the lines of the Perl Best Practices book, but probably shorter. =) HTH, Wayne I'm aware of Pep8. It's a good starting point. Anything more in-depth than Pep8 and the Zen of Python? Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] The Order of Imports and install order ofmodulesandother matters (XP vs W7, ...)
> -Original Message- > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Alan Gauld > Sent: Tuesday, February 16, 2010 5:58 PM > > "Hansen, Mike" wrote > > > I'm aware of Pep8. It's a good starting point. Anything > more in-depth > > than Pep8 and the Zen of Python? > > There is the generic book "Code Complete" which is excellent, but > definitely not short! > And it's not Python specific - in fact doesn't even mention > Python so far > as I recall. > But its advice is applicable to all languages. > > A bug fan, > > Alan g. Are you a bug fan of Code Complete? =) I need to revisit Code Complete. I read a huge amount of the first edition and about a 1/3 of the second edition. Although you can gather best practices from Pep8, the Zen of Python, The Python Cookbook, and other sources, it appears that a central resource for Python best practices doesn't exist. Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What Editori?
I'm surprised no one has mentioned ActiveState's KOMODO. I primarily use VIM, but I hop into KOMODO for doing little scripts and watching the output. KOMODO comes in two flavors, KOMODO Edit which is free and KOMODO IDE which costs about $300. I suspect that KOMODO Edit does most of what people need. For those that don't want the steep learning curve of VIM or Emacs, I'd recommend KOMODO. Mike No, I don't work for ActiveState. =) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Bowing out
> -Original Message- > From: tutor-bounces+mike.hansen=atmel@python.org > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Kent Johnson > Sent: Wednesday, March 03, 2010 6:18 AM > To: Tutor@python.org > Subject: [Tutor] Bowing out > > Hi all, > > After six years of tutor posts my interest and energy have waned and > I'm ready to move on to something new. I'm planning to stop reading > and contributing to the list. I have handed over list moderation > duties to Alan Gauld and Wesley Chun. > > Thanks to everyone who contributes questions and answers. I learned a > lot from my participation here. > > So long and keep coding! > Kent We know what's really going on. You are moving to Ruby Tutor. =) Good luck with your "something new", and thanks for the many years of help on this list. Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Recommendations on Workshops, Courses, Live Online Training
> -Original Message- > From: tutor-bounces+mike.hansen=atmel@python.org > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Tino Dai > Sent: Thursday, March 11, 2010 12:29 PM > To: Alan Gauld > Cc: tutor@python.org > Subject: Re: [Tutor] Recommendations on Workshops, > Courses,Live Online Training > > > > On Thu, Mar 11, 2010 at 1:22 PM, Alan Gauld > wrote: > > > > "Khalid Al-Ghamdi" wrote > > > > I've subscribed to ShowMeDo, but I feel > something more than just video > tutorials. Do you have any recommendations on > where I can find workshops, > Courses, Live Online Training where I can > interact with a real person that I > can ask questions and find the answers I'm looking for. > > > > Well (most) folks on the tutor list are live, and real > opersons and we > answer questions... But if you mean face to face then > consider a Python > users group - or evenas Linux User Group(more of them) > since Linux > users are often python users too... > > > > > Alan and the rest of the tutor regulars, > > I do know of a place in North Carolina, and the president > of the company > spoke @ PyCon this year. I don't know if this is the correct > venue to put that > sort of information. Guidance please. :) > > -Tino > > > If you have a pile of $ that you don't know what to do with, or if your company has deep pockets, then Big Nerd Ranch sounds like fun. http://www.bignerdranch.com/classes/python Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] How do I find information about a Python object.
Hi, I've downloaded IDLE python for windows. I've also downloaded Eclipse with the python addition. I have simple programs that will run on both IDLE and Eclipse. How do I get more information about a object/variable, such as proc in the example below. For example, if I execute the following: >>> proc = subprocess.Popen(['C:\\Progra~1\\putty\\plink','Catt'], shell=False) I can remote log into our Linux machine named 'Catt'. How do I find a list of attributes for the object/variable proc? I've tried subprocess.__doc__ and subprocess.Popen.__doc__. Random Googling shows that there are things like process identification numbers available - such as proc.pid. How do I find the other options? Thanks, Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Remote access from Windows PC to a Linux box
Hi,
I'm trying to connect to a Linux box from my Windows machine and execute a
series of commands - (ls, pwd, cat 'somefile', etc...). I'm using Putty to
do the ssh and have set up with Putty's Pagent agent to allow me to enter a
passphrase once per session to handle security keys between the two boxes
(so, no passwords needed for my remote scripts).
I have code that will give me a remote prompt on the Linux machine where I
can manually enter commands. This works great, but I want a script to always
execute the same series of commands without having to do so manually. I
also have code that will execute a single command like cat a file and write
the ouput to a new file. However, when I try to use the communicate object
in subprocess, my window hangs.
Here is my working code:
# module name data_collect.y
#
import subprocess
def simp_tst0(s_name):
# Opens a remote connection to "s_name and gives a prompt.
# Works great for executing linux commands.
# Does not exit gracefully when you type exit. The python
# prompt hangs when it gets to the r.communicate command
#
cmmnd_0="C:\\Progra~1\\putty\\plink %s" % s_name
r = subprocess.Popen("%s" % cmmnd_0,shell=False)
(r_stdout, r_stderr) = r.communicate("dir")
#status=r.poll() #Locks up if you try to poll here
print r_stdout
return r
def cat_remote(s_name, file2cat):
# This simple test file opens a remote connection to "s_name", does a
cat on
# file "file2cat" and writes the cat to an output file (out2.txt).
cmmnd_2="C:\\Progra~1\\putty\\plink %s cat %s" % (s_name, file2cat)
q = subprocess.Popen("%s" % cmmnd_2, stdout=open('out2.txt','w'))
def simp_tst3(s_name):
# Runs the initial subprocess.Popen command - creates proc.
# Hangs when you try to use proc.communicate
proc = subprocess.Popen(['C:\\Progra~1\\putty\\plink','Sula'],
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
#Either of the next two commands cause window to hang
#proc.stdin.write("dir")
#(stdout_value, stderr_value) = proc.communicate(input="dir")[0]
return proc
Thanks,
Mike
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Re: [Tutor] Python Examples of processing MS Outlook
> -Original Message- > From: tutor-bounces+mike.hansen=atmel@python.org > [mailto:tutor-bounces+mike.hansen=atmel@python.org] On > Behalf Of Peter Meagher > Sent: Friday, April 16, 2010 3:13 AM > To: tutor@python.org > Subject: [Tutor] Python Examples of processing MS Outlook > > Greetings, > > > > I'm doing a lot of email processing at the moment. I put > together some basic code from within Outlook to open my > default inbox, filter email records based on text in the > Subject field, then parse the body, finally send the output > to a text file. This is simple stuff but very useful. > > > > I need to do more, however as a newbie with Python, I figured > I could both learn and produce at the same time. > > > > Does anyone have references to simple MS Outlook 2007 > processing code that I could vulture for my purposes? (The > code that I adapted was from an old Office 2000 vba text, so > the version 2007 may not be that essential to my purposes) > > > > After much searching, I found a reference to PyWebmail, > however it communicates directly to the webmail accounts, is > much more than I really need and I want to stay in the > Outlook environment for a number of reasons, particularly its > interface to Access. > > > > Thank you. > > Peter Meagher > > You probably need to look at Python COM. Another problem with Outlook is that it has some security that prevents other programs from controlling it in response to various virus attacks. I think there's a way around it. Mike ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Remote access from Windows PC to a Linux box
Thanks Tim,
Your subprocess examples got me started in the right direction. I've moved
on to a slightly more advanced problem that I need help with.
I want to remotely start a Tshark packet capture session on one of our Linux
machines in the lab. I want to start the session from my Windows machine
running Python 2.5. The output capture file needs to be saved on the remote
Linux machine.
The example below nearly does what I want. It starts Tshark via Putty, runs
for 10 seconds then writes the capture file (out.txt) to a remote Linux
machine. The problem is that the putty session hangs open while Tshark is
running. So, I can't execute additional Python commands until the Tshark
capture finishes.
I've experimented with the Unix nohup command, but it does not seem to work
as expected with Tshark. If you call my function below with
>>> test_subp(alt_cmd=1)
then the nohup command is added to the subprocess command list (along with a
trailing '&' to send the command to background). This should work. Using
this alternate command, out.txt gets created, but is always empty.
Here is my code:
**
def test_subp(alt_cmd=0):
'''Establish a Putty connection with one of our Linux machines in the
lab.
Send Tshark command to start a data collection session over Putty.
'''
PLINK = 'C:\\Progra~1\\putty\\plink'
sess_name='LabComp1'
if alt_cmd:
'''This command does not work as expected. The tshark output file
(out.txt)is created,
but there is nothing in it '''
CMD_LIST=[PLINK,sess_name,'/usr/bin/nohup','/usr/bin/sudo
/usr/sbin/tshark', '-a', 'duration:10', '-i', 'wlan0', '-T', 'text',
'-V','>', 'out.txt','&'];
else:
'This command works great, writing tshark output to out.txt on the
remote machine.'
'Unfortunately, this command hangs the putty session until the
tshark capture ends'
CMD_LIST=[PLINK,sess_name,'/usr/bin/sudo /usr/sbin/tshark', '-a',
'duration:10', '-i', 'wlan0', '-T', 'text', '-V','>', 'out.txt'];
print "The command list you are sending to the subprocess is: \n", "\t",
CMD_LIST
PIPE = subprocess.PIPE
p = subprocess.Popen(CMD_LIST, stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate ()
print 'stdout = ', stdout
print 'stderr = ', stderr
*****
For both runs (atl_cmd=0 or alt_cmd=1), the stdout and stderr printouts at
the end of the script are empty.
Any suggestions would be appreciated.
Thanks,
Mike
***
On Wed, Mar 31, 2010 at 7:42 AM, Tim Golden wrote:
> On 30/03/2010 17:29, Mike Baker wrote:
>
>> I'm trying to connect to a Linux box from my Windows machine and execute a
>> series of commands
>>
>> I want a script to always
>> execute the same series of commands without having to do so manually. I
>> also have code that will execute a single command like cat a file and
>> write
>> the ouput to a new file. However, when I try to use the communicate object
>> in subprocess, my window hangs.
>>
>
>
> This works for me:
>
>
> import os, sys
> import subprocess
>
> PLINK = "plink"
> REMOTE_USER = "tgol...@web30.webfaction.com"
> PIPE = subprocess.PIPE
>
> p = subprocess.Popen ([PLINK, REMOTE_USER, "ls"], stdout=PIPE)
> stdout, stderr = p.communicate ()
> print "#1:", stdout.splitlines ()[0]
>
> with open ("out.txt", "w") as f:
> p = subprocess.Popen ([PLINK, REMOTE_USER, "cat .bashrc"], stdout=f)
> p.communicate ()
> print "#2:", open ("out.txt").read ().splitlines ()[0]
>
> p = subprocess.Popen ([PLINK, REMOTE_USER], stdin=PIPE, stdout=PIPE)
> stdout, stderr = p.communicate ("ls\nexit\n")
> print "#3", stdout
>
> p = subprocess.Popen ([PLINK, REMOTE_USER], stdin=PIPE, stdout=PIPE)
> p.stdin.write ("ls\nexit\n")
> stdout, stderr = p.communicate ()
> print "#4", stdout
>
>
>
> A few things to note, none of which I believe to be germane to the
> issues you're experiencing:
>
> * You almost never need to use shell=True on a Windows call to subprocess.
> If in doubt, don't use it.
>
> * Definitely better to pass the list-of-params style as the first param
> of subprocess.Popen; it sorts out issues with embedded spaces etc.
>
> * The open ("...", "w") in your second example *may* be closing the
> file immediately. I doubt it, since you'd expect Popen to hold a
> reference, but I haven't checked the implementation.
>
> TJG
>
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Re: [Tutor] Remote access from Windows PC to a Linux box
Yashwin, Thanks! Your nohup redirection worked great! - Mike On Wed, Apr 21, 2010 at 2:45 PM, Yashwin Kanchan wrote: > Hi Mike > > have you tried running the tshark process in the background... > > *CMD_LIST=[PLINK,sess_name,'/usr/bin/sudo /usr/sbin/tshark &', '-a', > 'duration:10', '-i', 'wlan0', '-T', 'text', '-V','>', 'out.txt'];* > > Or if you are using NOHUP try redirecting this way... > > *CMD_LIST=[PLINK,sess_name,'/usr/bin/nohup','/usr/bin/sudo > /usr/sbin/tshark > out.txt 2> out.err < /dev/null ', '-a', 'duration:10', > '-i', 'wlan0', '-T', 'text','&'];* > > Regards > Yashwin Kanchan > > > On 21 April 2010 19:15, Mike Baker wrote: > >> Thanks Tim, >> >> Your subprocess examples got me started in the right direction. I've >> moved on to a slightly more advanced problem that I need help with. >> >> I want to remotely start a Tshark packet capture session on one of our >> Linux machines in the lab. I want to start the session from my Windows >> machine running Python 2.5. The output capture file needs to be saved on >> the remote Linux machine. >> >> The example below nearly does what I want. It starts Tshark via Putty, >> runs for 10 seconds then writes the capture file (out.txt) to a remote Linux >> machine. The problem is that the putty session hangs open while Tshark is >> running. So, I can't execute additional Python commands until the Tshark >> capture finishes. >> >> I've experimented with the Unix nohup command, but it does not seem to >> work as expected with Tshark. If you call my function below with >> >>> test_subp(alt_cmd=1) >> then the nohup command is added to the subprocess command list (along >> with a trailing '&' to send the command to background). This should work. >> Using this alternate command, out.txt gets created, but is always empty. >> >> >> Here is my code: >> ** >> def test_subp(alt_cmd=0): >> '''Establish a Putty connection with one of our Linux machines in the >> lab. >> Send Tshark command to start a data collection session over Putty. >> ''' >> PLINK = 'C:\\Progra~1\\putty\\plink' >> sess_name='LabComp1' >> if alt_cmd: >> '''This command does not work as expected. The tshark output file >> (out.txt)is created, >> but there is nothing in it ''' >> CMD_LIST=[PLINK,sess_name,'/usr/bin/nohup','/usr/bin/sudo >> /usr/sbin/tshark', '-a', 'duration:10', '-i', 'wlan0', '-T', 'text', >> '-V','>', 'out.txt','&']; >> else: >> 'This command works great, writing tshark output to out.txt on the >> remote machine.' >> 'Unfortunately, this command hangs the putty session until the >> tshark capture ends' >> CMD_LIST=[PLINK,sess_name,'/usr/bin/sudo /usr/sbin/tshark', '-a', >> 'duration:10', '-i', 'wlan0', '-T', 'text', '-V','>', 'out.txt']; >> print "The command list you are sending to the subprocess is: \n", >> "\t", CMD_LIST >> >> PIPE = subprocess.PIPE >> p = subprocess.Popen(CMD_LIST, stdout=PIPE, stderr=PIPE) >> stdout, stderr = p.communicate () >> print 'stdout = ', stdout >> print 'stderr = ', stderr >> * >> >> For both runs (atl_cmd=0 or alt_cmd=1), the stdout and stderr printouts at >> the end of the script are empty. >> >> Any suggestions would be appreciated. >> >> Thanks, >> >> Mike >> >> *** >> >> On Wed, Mar 31, 2010 at 7:42 AM, Tim Golden wrote: >> >>> On 30/03/2010 17:29, Mike Baker wrote: >>> >>>> I'm trying to connect to a Linux box from my Windows machine and execute >>>> a >>>> series of commands >>>> >>>> I want a script to always >>>> execute the same series of comm
[Tutor] Fwd: for loop results into list
Should have sent this to the list too -- Forwarded message -- From: Micheal Beatty Date: Sun, Sep 5, 2010 at 2:38 PM Subject: Re: [Tutor] for loop results into list To: Andre Engels On 09/05/2010 02:16 PM, Andre Engels wrote: > > On Sun, Sep 5, 2010 at 8:51 PM, Micheal Beatty wrote: >> >> On 09/05/2010 01:26 PM, Evert Rol wrote: Hello all, I'm having a little problem figuring out how to accomplish this simple task. I'd like to take a list of 6 numbers and add every permutation of those numbers in groups of four. For example for 1, 2, 3, 4, 5, 6 add 1 + 1 + 1 +1 then 1 + 1 + 1 +2 etc. until reaching 6 + 6 + 6 + 6. Using a for loop, that was the easy part, now I'd like to take the results and count the number of times each number occurs. My problem occurs when I try to create a list from the results of the for loop, it puts each individual number into its own list. I've looked everywhere for the solution to this and can find nothing to help. Any suggestions would be much appreciated >>> >>> If you had some code, that would be very helpful. Now it's a bit of >>> guesswork what exactly you have (code tends to be clearer than a full >>> paragraph or two of text). >>> At least, I currently don't understand what your problem is (or what your >>> for-loop involves). >>> Eg, are you looping and calling a function recursively, do you have four >>> nested loops (or nested list comprehensions)? Or some other convenient loop >>> to step through all combinations? >>> >>> Anway, if you have a recent Python version (2.7 or 3.1), the itertools >>> module provides a handy utiity: >>> http://docs.python.org/py3k/library/itertools.html#itertools.combinations_with_replacement >>> Eg, >>> >> map(sum, combinations_with_replacement(range(1,7), 4)) >>> >>> [4, 5, 6, 7, 8, 9, 6, 7, 8, 9, 10, 8, 9, 10, 11, 10, 11, 12, 12, 13, 14, >>> 7, 8, 9, 10, 11, 9, 10, 11, 12, 11, 12, 13, 13, 14, 15, 10, 11, 12, 13, 12, >>> 13, 14, 14, 15, 16, 13, 14, 15, 15, 16, 17, 16, 17, 18, 19, 8, 9, 10, 11, >>> 12, 10, 11, 12, 13, 12, 13, 14, 14, 15, 16, 11, 12, 13, 14, 13, 14, 15, 15, >>> 16, 17, 14, 15, 16, 16, 17, 18, 17, 18, 19, 20, 12, 13, 14, 15, 14, 15, 16, >>> 16, 17, 18, 15, 16, 17, 17, 18, 19, 18, 19, 20, 21, 16, 17, 18, 18, 19, 20, >>> 19, 20, 21, 22, 20, 21, 22, 23, 24] >>> >>> seems to do what you want. >>> >>> But, I'd still say to adopt your own code first, and when you've learned >>> from that, just use the one-liner above. You're most welcome to ask your >>> question, best done in combination with code, actual output and expected >>> output. Then we can point you in the right direction. >>> >>> Cheers, >>> >>> Evert >>> >> Thanks Evert, here is the code. >> >> >> fourdsix = [1, 2, 3, 4, 5, 6] >> for i in fourdsix: >> for j in fourdsix: >> for k in fourdsix: >> for l in fourdsix: >> fourdsix_result = [i, j, k, l] >> attribs = sum(fourdsix_result) - min(fourdsix_result) >> print attribs >> >> This gives me the proper results, now it's just a matter of getting it into >> a list so I can further work with the data. >> I've tried the following >> attrib_list = [attribs] >> >> and >> attrib_list = [] >> attrib_list.append(attribs) >> print attrib_list >> >> but these both only create a list of the last number. > > Put the attrib_list = [] before the beginning of the outer loop, and > it should work as intended. Now you are creating a new list each time, > which is not what you want. > > > This gets me close, as it puts the results together into a list but it goes through every set of permutations and gives me a list. e.g. [3] [3, 4] [3, 4, 5] [3, 4, 5, 6] [3, 4, 5, 6, 7] and so on ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Can't figure out why this is printing twice
I have the following code:
import gzip
import datetime
date = datetime.date.today()
name = date.strftime('%m-%d-%Y')+'.gz'
date.strftime('%m-%d-%Y')+'.gz'
print "The name of the file will be", name
the output is:
The name of the file will be
The name of the file will be 06-08-2009.gz
I can't figure out why 'The name of the file will be' is printing twice. Any
help appreciated.
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Re: [Tutor] Can't figure out why this is printing twice
On Tue, Jun 9, 2009 at 3:00 AM, Mike Hoy wrote:
> Here's the screenshot:
>
> http://img40.imageshack.us/img40/7124/printtwice.png
>
> In case the image goes down here's the code:
> import gzip
> import datetime
> date = datetime.date.today()
> name = date.strftime('%m-%d-%Y')+'.gz'
> print "The name of the file will be", name
>
> Here's the output:
> -
> mho...@blackbox:~/code/python$ python gzip2.py
> The name of the file will be
> The name of the file will be 06-09-2009.gz
> -
> It's Python 2.6.2 on Ubuntu 9.04
>
> -Mike Hoy
>
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Re: [Tutor] Can't figure out why this is printing twice
> > On Tue, Jun 9, 2009 at 6:34 AM, The Green Tea Leaf < > thegreenteal...@gmail.com> wrote: > >> I got an email from him that he had a gzip.pyc file in that folder. >> Once he deleted that everything works OK. > > > Heh... I think I've made that mistake before; > > "My import statement doesn't work right! When I "import " it tells > me none of the methods are available!" > > And then I realize my file was named that. Doh! > > live and learn though, eh? > Yea and I knew better than to do that too. Guess I had to make the mistake to really get it into my head. Funny how that works. You read all about that stuff in books, but you don't actually know it until you put it into practice. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Best Python Editor
Try out Vim. It may take you a week to get used to it. Best thing I ever did was finally get started on Vim. Once I got used to it I was very happy. Google around for Vim tutorials. There is a #VIM channel on freenode I believe. There is also a VIM mailing list that is very helpful. You won't need these for long. Once you get used to it and think you've learned all you can you find out there's even more stuff you can do with it. If you wanna try Emacs go for it. You don't need an IDE for python. In the very beginning of writing python I wrote on windows using notepad and Linux using Gedit. While Gedit was better it was nothing compared to Vim. My favorite thing to do is open vim one one document I'm working on, then split the screen horizonatally for each other relevent document I'm working on. I can thing split it vertically as well. I also know that once you have saved your python document in vim you can test out your code by typing :!python % and it invokes the python interpreter in a shell for that script. Then when the program is done it returns to Vim. It also indents and colors syntax for my other languages as well: C/Java/HTML/CSS. So it's something that you use for life once you get that feeling of enlightenment that comes from never having to remove your hands from the keyboard. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Best Python Editor
> > > > I really like using F5 to run my code, so you can put in your .vimrc so you > don't have to type it, or just type it every time: > > map :!python % > > and every time you hit it will run your current script. > > Thanks for that. It's even better than typing :!python % because it doesn't spawn a shell separate from the Vim window. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python List Help
Hi all,
I am a PHP developer that just started learning Python for a specific
application and the transition has been pretty easily assisted by google,
but I just dont see the issue with this one?
Ive got a list that created and populate in a loop that shows the correct
info when I print it, but if I try to print array[0], it says the list index
is out of range.
Here is the code snippet. Basically, I have a link here that I am pulling
the href info from and splitting it up, only keeping the 5th value, which I
am then adding to the playerid array.
playerid = []
for i in range(0, players):
player = playerlink[i]['href']
breakup = player.split('/')
playerid.append(breakup[4])
stats = test.findAll(text=True)
print len(playerid) ß this shows the expected result
print playerid[0] ßthis kills the script
33 print len(playerid)
34 print playerid[0]
35
playerid = []
: list index out of range
args = ('list index out of range',)
message = 'list index out of range'
If I change the print playerid[0] to print playerid[1], same error, but if I
change it to print playerid[2] or higher, it will show the same error, but
the playerid= [] will show the actual list values in the debug.
Any help would be appreciated, thank you!
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Re: [Tutor] Python List Help
Thanks for the reply and Tips Dave...
I think the formatting came out weird because I didnt specify plain text
when I created the email.
I'm using Google App Engine and it's internal debugger shows what I posted
earlier when the code breaks, I agree that what I am seeing from the
debugger makes no sense...
Thanks for the tips, I will look at what you have and see if I can make it
work...
>From top to bottom, I am using BeautifulSoup to parse an html document and
what you are seeing is a part of the processing that just didnt jive with
practices that I had already carried over and had working with the rest of
the code. I dont have it set up to do the import with an interpreter
session like you laid out below, basically I am printing the stuff as it
goes, it's in a loop and this code is processed multiple times.
Honestly, I need to do some reading on how python works as I was plugging
along on this script with just a couple of hours into python for this
scraping project, but what you have shown me here will help and I will come
back to the list after I have a better understanding of what I am doing.
Thanks,
Mike
-Original Message-
From: Dave Angel [mailto:da...@ieee.org]
Sent: Monday, October 19, 2009 1:35 PM
To: Mike Sweany
Cc: tutor@python.org
Subject: Re: [Tutor] Python List Help
Mike Sweany wrote:
> Hi all,
>
>
>
> I am a PHP developer that just started learning Python for a specific
> application and the transition has been pretty easily assisted by google,
> but I just dont see the issue with this one?
>
>
>
> Ive got a list that created and populate in a loop that shows the correct
> info when I print it, but if I try to print array[0], it says the list
index
> is out of range.
>
>
>
> Here is the code snippet. Basically, I have a link here that I am pulling
> the href info from and splitting it up, only keeping the 5th value, which
I
> am then adding to the playerid array.
>
>
>
> playerid = []
>
> for i in range(0, players):
>
> player = playerlink[i]['href']
>
> breakup = player.split('/')
>
> playerid.append(breakup[4])
>
>
>
> stats = test.findAll(text=True)
>
> print len(playerid) ß this shows the expected result
>
> print playerid[0] ßthis kills the script
>
>
>
>
>
>
>33 print len(playerid)
>
>
>34 print playerid[0]
>
>
>35
>
>
>
> playerid = []
>
> : list index out of range
> args = ('list index out of range',)
> message = 'list index out of range'
>
> If I change the print playerid[0] to print playerid[1], same error, but if
I
> change it to print playerid[2] or higher, it will show the same error, but
> the playerid= [] will show the actual list values in the debug.
>
> Any help would be appreciated, thank you!
>
>
>
>
I'm very confused about your formatting. You seem to be using tabs with
a large column setting (prefer 4 columns, and tabs should become spaces
in the editor). But there's no context. So this stuff is indented, but
it's not inside a function?? And the numbers 33, 34, and 35, what are
they from?
What debugger are you running, that somehow displays list values when
you assign an empty list to playerid? That makes no sense. If it's an
exotic debugger, then perhaps you should be doing this straight from the
python interpreter.
I suggest that until you're comfortable enough with python to know what
to include, that you post exactly what happened, without trying so hard
to customize it.
Show the file, in its entirety (if it's too big, then you would need a
smaller example). And put markers at begin and end so we can see what
part is the file.
Then if you're running from the interpreter prompt, show the whole
session, from import to the traceback error.
Note that if you want to print variables from the imported program,
you'd use
>>> print mymodule.playerid
The following is not intended to be good programming, it's intended to
encapsulate what you already had, with some initialization to avoid
needing other stuff that's presumably irrelevant here.
***file stuff2.py
#!/usr/bin/env python
#-*- coding: utf-8 -*-
link0 = {"href":"this /is /a /test/of the stuff/before here"}
link1 = {"href":"this /is /a /test/different stuff/before here"}
link2 = {"href":"this /is /a /test/other stuff/before here"}
playerlink = [link0, link1, link2]
players = len(playerlink)
def doit():
global playe
[Tutor] atof error
I got an unexpected error today using string.atof. ValueError: invalid literal for float(): -17,019.797 To me -17,019.797 looks like a perfectly good floating point number. I cannot find documentation on what the allowed range is. -- Mike Procario "Another casualty of applied metaphysics" -Calvin and Hobbes ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Objects, persistence & getting
Subject: Re: [Tutor] Objects, persistence & getting From: "Alan Gauld" <[EMAIL PROTECTED]> Date: Mon, 17 Jan 2005 07:48:28 - To: "Liam Clarke" <[EMAIL PROTECTED]>, "Tutor Tutor" To: "Liam Clarke" <[EMAIL PROTECTED]>, "Tutor Tutor" Well, one thing learning Java is good for is for thoroughly demystifying OOP. I'd have to disagree here because Java's version of OOP has very little to do with real OOP. Java just uss classes as a kind of modularisation mechanism and does not make much use of tthe real OO features. In fact it doesn't even support several of the things that enable real OO programming. And its class library, a strong feature because it is a standard, is dreadful from an OOP p[erspective. In fact I usually refer to Java as a Class Oriented Programming rather than Object Oriented. It is possible to use Java in an OOP way (read Brice Eckel's "Thinking in Java" to see how) but the language itself encourages a style of programming that is much more like Pythons modules than true OOP. It's not some magical acronym of programming goodness, it's just an 'organic' way to organise code. Certainly in Java thats true, and indeed even at the higher level OOP is a way of organizing code - by finding high level abstractions and building tree structures based on common intefaces. But Java doesn't encourage that structuring as much as Python does! Alan G. I've been reading The Object Oriented Thought Process, and it's been clearing up the OOP mystery for me. After reading a big chunk of it, I re-read the OOP sections in Learning Python. It's making a lot more sense now. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Matching with beginning of the line in the character set
Alternatively, you could .split() your string and not invoke the
mechanisms dealing with regular expressions.
Is this considered stylistically sloppy in the event that the split
results in a very long array? Sloppier than REs are to begin with?
I think that the problem with [\A\d] is that \A is zero-length, which
doesn't make sense in the context of []. Brackets aren't shorthand
for "'or' a bunch of small things together" but rather "'or' a bunch
of these single-character matches together"
mike
On Tue, 1 Feb 2005 13:30:44 -0500, Smith, Jeff <[EMAIL PROTECTED]> wrote:
> Kent,
>
> I think \b will work for me since I was really looking for [\A\W]
> anyway.
>
> That still doesn't answer the generalized question about something like
> [\A\d] for instance.
>
> Thanks,
> Jeff
>
> BTW, I was using raw strings although I forgot to put that in.
>
> -Original Message-
> From: Kent Johnson [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, February 01, 2005 1:15 PM
> Cc: Tutor@python.org
> Subject: Re: [Tutor] Matching with beginning of the line in the
> character set
>
> Smith, Jeff wrote:
> > I want to match a string which is preceeded by a space or occurs at
> > the beginning of the line. I also don't want to catch the preceeding
> > character as a group.
> >
> > I have found both of the following to work
> > re.compile('(?:^|\s)string')
> > re.compile('(?:\A|\s)string')
>
> How about r'\bstring' ? It doesn't mean quite the same as \sstring but
> it might work for you.
>
> >
> > But would prefer to use the more concise [] notation. However
> > re.compile('[^\s]string')
>
> As the first character in [], ^ means 'not'.
>
> > Does not work and
> > re.compile('[\A\s]string')
>
> I guess \A doesn't count as a 'character class'? Or do you need to be
> using raw strings?
>
> Kent
>
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>
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Re: [Tutor] i have a question???
>num = num + math.pi/6.0 ## Don't forget .0 or you'll get an integer the division operator returns a float when either of the operands are floats -- in this case math.pi is, so you don't have to worry about passing it 6.0 instead of 6 >>> import math >>> math.pi 3.1415926535897931 >>> math.pi / 6 0.52359877559829882 >>> type(math.pi) >>> type(6) >>> type(6.0) mike On Thu, 3 Feb 2005 16:04:25 -0500, Jacob S. <[EMAIL PROTECTED]> wrote: > >From what I understand, range() no longer allows you to use floats as > arguments. (Or it gives you a deprication warning) > This tutorial must be old. > > Not the only way, but. > > import math > num = 0 > while num <= 2*math.pi: > ## Do stuff to figure pi/6 things > > num = num + math.pi/6.0 ## Don't forget .0 or you'll get an integer > result. > print ## Result thingy > > Another way is to use Numarry (Numeric) arange() but that takes extra work. > ;-) > Jacob > > > > This is from a tutorial > > > > "EXERCISE 3.9 > > Use the math library to write a program to print out > > the sin and cos of numbers from 0 to 2pi in intervals > > of pi/6. You will need to use the range() function." > > > > Range won't let me use pi/6 as an incremator > > is there some other way i can accomplish this task > > im new to programming so all the help i can get is > > greatly appreciated. > > NI! > > alex > > > > > > > > > > __ > > Do you Yahoo!? > > The all-new My Yahoo! - What will yours do? > > http://my.yahoo.com > > ___ > > Tutor maillist - Tutor@python.org > > http://mail.python.org/mailman/listinfo/tutor > > > > > > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] manipulating a file
without the explicit newlines in file.write(i), could it be that the file was closed before the write buffer was ever flushed? mike On Mon, 7 Feb 2005 14:58:03 -0500, Smith, Jeff <[EMAIL PROTECTED]> wrote: > -Original Message- > From: Alan Gauld [mailto:[EMAIL PROTECTED] > Sent: Monday, February 07, 2005 2:49 PM > To: Reed L. O'Brien; tutor@python.org > Subject: Re: [Tutor] manipulating a file > > >You should add a newline character otherwise you will just > >get one enormously long line! > > > >dstfile.write(i+'\n') > > In these cases, I've taken to doing > print >> dstfile, I > > ...hmmm starting to look like Perl's many ways to accomplish the same > thing approach :-) > > Jeff > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python's default argument value handling in functions - weird syntax? problem grappling with the concept
The function's local variable L is not static, but "default argument value" is, which is what the documentation means when it says that it will evaluate these only once. When the default value is a list (in your code, not "the empty list" but a list which happens to be empty when the default arguments are being evaluated), that same object is used every time the function is called. mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] newbie OSX module path question
I'm on OS X, and I cannot get Python to import modules I've saved. I have created the the environment.plist file and appended it with my desired module path. If I print sys.path from the interpreter, my new path does indeed show up as the first listing, yet any attempt at importing modules from this directory fails with ImportError. What am I doing wrong? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] newbie OSX module path question
Hm, so if I import glob, and then execute this line:
print glob.glob('/Local_HD/Users/mike/Documents/pythonModules/*.py')
I simply get brackets returned:
[]
...not sure what this means. Thanks again.
On Feb 14, 2005, at 5:41 PM, Danny Yoo wrote:
On Mon, 14 Feb 2005, Mike Hall wrote:
Can you show us what your sys.path looks like? Just do a
cut-and-paste so we can quickly validate it for you.
Thanks for the response. Here's a paste of what sys.path returns. The
first listing is the path inside of environment.plist:
['', '/Local_HD/Users/mike/Documents/pythonModules',
'/Users/tempmike/Documents/pythonModules',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python23.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/plat-darwin',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/plat-mac',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/plat-mac/lib-scriptpackages',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/lib-tk',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/lib-dynload',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/
python2.3/site-packages']
Can you show us the exact thing you're typing, as well as the literal
error that Python shows?
I will attempt to import using 'import' followed by file name.
Example:
import module1
The error returned will be:
ImportError: No module named module1
[Meta: Please keep python-tutor in CC, so that all of us on the mailing
list can help you.]
Hi Mike,
Ok, can you do this at the Python prompt?
###
import glob
print glob.glob('/Local_HD/Users/mike/Documents/pythonModules/*.py')
###
Copy and paste the output you see.
If things go wrong, then we will have a good focus point to debug the
problem. But if things go right --- if you see a bunch of Python
module
files --- then I will be stuck and will have to think of something
else.
*grin*
Do you have problems doing an import if your modules's directory is
the current working directory?
Funny you should mention that. After posting to this list, I tried
cd'ing over to the dir I created for modules, and then launched
Python.
My modules can indeed be imported using this method. But I'm still
curious as to why I cannot get a successful import (when I'm not
within
my work dir) when the path is visibly defined within the sys.path
variable? Thanks very much.
Ok, so there appears to be nothing wrong with the modules themselves or
with importing them when they're in the current working directory. We
should then focus on sys.path itself, since that's the mechanism Python
uses to lookup modules that aren't in the current directory.
For the moment, I'll assume that there's something funky with the
pathname. As mentioned earlier, it could be as subtle as a
case-sensitivity issue. The glob statement above will help us check to
see if Python can see those files, at least.
Best of wishes to you!
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Re: [Tutor] newbie OSX module path question
Ok, I've got it working. The environment.plist file wants a path
beginning with /Users, not /Local_HD. So simple! Thanks everyone.
On Feb 14, 2005, at 6:26 PM, David Rock wrote:
* Mike Hall <[EMAIL PROTECTED]> [2005-02-14 18:22]:
Hm, so if I import glob, and then execute this line:
print glob.glob('/Local_HD/Users/mike/Documents/pythonModules/*.py')
I simply get brackets returned:
[]
...not sure what this means. Thanks again.
It means it didn't find anything that matches that pattern, which
suggests that the directory does not contain *.py files. That might be
a
problem. ;-)
--
David Rock
[EMAIL PROTECTED]
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Re: [Tutor] Help with error handling in a while loop
I haven't tried the code, but it looks like you need to increment on connection failures, too. I think it's more pythonic to iterate over a range, as in the following for test_port in range(start_port, end_port) but it would suffice to just move the start_port+=1 outside of the try ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Time Controlled Execution
On Windows it looks like msvcrt will give you a non-blocking terminal read -- on mac / *nix systems it looks a little trickier: http://mail.python.org/pipermail/pythonmac-sig/2004-February/010140.html The os module in windows doesn't even have O_NONBLOCK. That seems like trouble. m On Sun, 20 Feb 2005 20:55:40 +0530, Varun Soundararajan <[EMAIL PROTECTED]> wrote: > Hi, > I want to know how to do this: > I have an executable file, which reads input from stdin provided > output at stdout or stderr. > I have to run it for a specific period of time (say 5 secs), get the > output and display it. > If i use popen(), this way: > from subprocess import * > p = Popen(["test","test.out"], shell=True) > p.wait() > print p.stdin,p.stdout > I dont get output in p.stdout.Apart from this, can u say how to stop > this subprocess after 5 secs (or whatever time frame specified)? > signal SIGALRM may not work (as i want it to work in windows & unix). > -Varun > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] threads
If what you want is something that scales up, then you're attacking the Wrong Problem. Rather than focus on getting your thread overhead as small as possible in order to support as much real-time concurrency as you can, you should (as has been suggested) try to get simulation-time concurrency without worrying about what happens in real-time. Then you can have arbitrarily many things happening at once. This introduction to discrete event simulation explains the idea: http://www.dmem.strath.ac.uk/~pball/simulation/simulate.html mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] gensuitemodule?
I'm seeing it used in a Python/Applescript tutorial, though am unclear on it's exact purpose or usage. Can someone fill me in? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Re: Newbie question.
Subject: Re: [Tutor] Newbie question. From: Gwyn Evans <[EMAIL PROTECTED]> Date: Fri, 4 Mar 2005 09:37:21 + To: tutor@python.org To: tutor@python.org On Fri, 28 Jan 2005 09:42:07 +0200, Adriaan Louw <[EMAIL PROTECTED]> wrote: I want to learn python as quick as possible, for web programming at first, and applications later on. Any leads? Hi, I'd start with the basic python tutorials, then have a look at something like CherryPy (http://www.cherrypy.org/) or Quixote (http://www.quixote.ca/) for the initial web stuff - there are others, too. Try & read around each a bit, e.g. web site/mailing lists, then download & give ones you fancy a try. I would politely disagree here. You need to walk before you can run. If you haven't done _any_ web programming before, it's probably best to do a small web app using just python's cgi module. I would think that CherryPy and Quixote are complex web tools/frameworks that I wouldn't recommend to someone new to web programming until they got their feet wet doing some basic web programming. After that, then explore more advanced web programming with CherryPy or Quixote. If you have done some basic web programming in other languages, then ignore this message. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] regular expression question
I'd like to get a match for a position in a string preceded by a specified word (let's call it "Dog"), unless that spot in the string (after "Dog") is directly followed by a specific word(let's say "Cat"), in which case I want my match to occur directly after "Cat", and not "Dog." I can easily get the spot after "Dog," and I can also get it to ignore this spot if "Dog" is followed by "Cat." But what I'm having trouble with is how to match the spot after "Cat" if this word does indeed exist in the string.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression question
First, thanks for the response. Using your re:
my_re = re.compile(r'(dog)(cat)?')
...I seem to simply be matching the pattern "Dog". Example:
>>> str1 = "The dog chased the car"
>>> str2 = "The dog cat parade was under way"
>>> x1 = re.compile(r'(dog)(cat)?')
>>> rep1 = x1.sub("REPLACE", str1)
>>> rep2 = x2.sub("REPLACE", str2)
>>> print rep1
The REPLACE chased the car
>>> print rep2
The REPLACE cat parade was under way
...what I'm looking for is a match for the position in front of "Cat",
should it exist.
On Mar 8, 2005, at 5:54 PM, Sean Perry wrote:
Mike Hall wrote:
I'd like to get a match for a position in a string preceded by a
specified word (let's call it "Dog"), unless that spot in the string
(after "Dog") is directly followed by a specific word(let's say
"Cat"), in which case I want my match to occur directly after "Cat",
and not "Dog."
I can easily get the spot after "Dog," and I can also get it to
ignore this spot if "Dog" is followed by "Cat." But what I'm having
trouble with is how to match the spot after "Cat" if this word does
indeed exist in the string.
. >>> import re
. >>> my_re = re.compile(r'(dog)(cat)?') # the ? means "find one or
zero of these, in other words cat is optional.
. >>> m = my_re.search("This is a nice dog is it not?")
. >>> dir(m)
['__copy__', '__deepcopy__', 'end', 'expand', 'group', 'groupdict',
'groups', 'span', 'start']
. >>> m.span()
(15, 18)
. >>> m = my_re.search("This is a nice dogcat is it not?")
. >>> m.span()
(15, 21)
If m is None then no match was found. span returns the locations in
the string where the match occured. So in the dogcat sentence the last
char is 21.
. >>> "This is a nice dogcat is it not?"[21:]
' is it not?'
Hope that helps.
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Re: [Tutor] regular expression question
This will match the position in front of "dog": (?<=dog) This will match the position in front of "cat": (?<=cat) This will not match in front of "dog" if "dog" is followed by "cat": (?<=dog)\b (?!cat) Now my question is how to get this: (?<=cat) ...but ONLY if "cat" is following "dog." If "dog" does not have "cat" following it, then I simply want this: (?<=dog) ...if that makes sense :) thanks. On Mar 8, 2005, at 6:05 PM, Danny Yoo wrote: On Tue, 8 Mar 2005, Mike Hall wrote: I'd like to get a match for a position in a string preceded by a specified word (let's call it "Dog"), unless that spot in the string (after "Dog") is directly followed by a specific word(let's say "Cat"), in which case I want my match to occur directly after "Cat", and not "Dog." Hi Mike, You may want to look at "lookahead" assertions. These are patterns of the form '(?=...)' or '(?!...). The documentation mentions them here: http://www.python.org/doc/lib/re-syntax.html and AMK's excellent "Regular Expression HOWTO" covers how one might use them: http://www.amk.ca/python/howto/regex/ regex.html#SECTION00054 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regular expression question
Sorry, my last reply crossed this one (and yes, I forgot again to CC
the list).
I'm experimenting now with your use of the "or" operator( "|") between
two expressions, thanks.
On Mar 8, 2005, at 6:42 PM, Danny Yoo wrote:
On Tue, 8 Mar 2005, Mike Hall wrote:
Yes, my existing regex is using a look behind assertion:
(?<=dog)
...it's also checking the existence of "Cat":
(?!Cat)
...what I'm stuck on is how to essentially use a lookbehind on "Cat",
but only if it exists.
Hi Mike,
[Note: Please do a reply-to-all next time, so that everyone can help
you.]
Regular expressions are a little evil at times; here's what I think
you're
thinking of:
###
import re
pattern = re.compile(r"""dog(?!cat)
...| (?<=dogcat)""", re.VERBOSE)
pattern.match('dogman').start()
0
pattern.search('dogcatcher').start()
pattern.search('dogman').start()
0
pattern.search('catwoman')
###
but I can't be sure without seeing some of the examples you'd like the
regular expression to match against.
Best of wishes to you!
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Re: [Tutor] regular expression question
I'm having some strange results using the "or" operator. In every test
I do I'm matching both sides of the "|" metacharacter, not one or the
other as all documentation says it should be (the parser supposedly
scans left to right, using the first match it finds and ignoring the
rest). It should only go beyond the "|" if there was no match found
before it, no?
Correct me if I'm wrong, but your regex is saying "match dog, unless
it's followed by cat. if it is followed by cat there is no match on
this side of the "|" at which point we advance past it and look at the
alternative expression which says to match in front of cat."
However, if I run a .sub using your regex on a string contain both dog
and cat, both will be replaced.
A simple example will show what I mean:
>>> import re
>>> x = re.compile(r"(A) | (B)")
>>> s = "X R A Y B E"
>>> r = x.sub("13", s)
>>> print r
X R 13Y13 E
...so unless I'm understanding it wrong, "B" is supposed to be ignored
if "A" is matched, yet I get both matched. I get the same result if I
put "A" and "B" within the same group.
On Mar 8, 2005, at 6:47 PM, Danny Yoo wrote:
Regular expressions are a little evil at times; here's what I think
you're
thinking of:
###
import re
pattern = re.compile(r"""dog(?!cat)
...| (?<=dogcat)""", re.VERBOSE)
pattern.match('dogman').start()
0
pattern.search('dogcatcher').start()
Hi Mike,
Gaaah, bad copy-and-paste. The example with 'dogcatcher' actually does
come up with a result:
###
pattern.search('dogcatcher').start()
6
###
Sorry about that!
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Re: [Tutor] regular expression question
Indeed I do:
>>> import re
>>> x = re.compile('A|B')
>>> s = " Q A R B C"
>>> r = x.sub("13", s)
>>> print r
Q 13 R 13 C
On Mar 9, 2005, at 12:09 PM, Liam Clarke wrote:
Hi Mike,
Do you get the same results for a search pattern of 'A|B'?
On Wed, 9 Mar 2005 11:11:57 -0800, Mike Hall
<[EMAIL PROTECTED]> wrote:
I'm having some strange results using the "or" operator. In every
test
I do I'm matching both sides of the "|" metacharacter, not one or the
other as all documentation says it should be (the parser supposedly
scans left to right, using the first match it finds and ignoring the
rest). It should only go beyond the "|" if there was no match found
before it, no?
Correct me if I'm wrong, but your regex is saying "match dog, unless
it's followed by cat. if it is followed by cat there is no match on
this side of the "|" at which point we advance past it and look at the
alternative expression which says to match in front of cat."
However, if I run a .sub using your regex on a string contain both dog
and cat, both will be replaced.
A simple example will show what I mean:
import re
x = re.compile(r"(A) | (B)")
s = "X R A Y B E"
r = x.sub("13", s)
print r
X R 13Y13 E
...so unless I'm understanding it wrong, "B" is supposed to be ignored
if "A" is matched, yet I get both matched. I get the same result if I
put "A" and "B" within the same group.
On Mar 8, 2005, at 6:47 PM, Danny Yoo wrote:
Regular expressions are a little evil at times; here's what I think
you're
thinking of:
###
import re
pattern = re.compile(r"""dog(?!cat)
...| (?<=dogcat)""", re.VERBOSE)
pattern.match('dogman').start()
0
pattern.search('dogcatcher').start()
Hi Mike,
Gaaah, bad copy-and-paste. The example with 'dogcatcher' actually
does
come up with a result:
###
pattern.search('dogcatcher').start()
6
###
Sorry about that!
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Re: [Tutor] regular expression question
But I only want to ignore "B" if "A" is a match. If "A" is not a match,
I'd like it to advance on to "B".
On Mar 9, 2005, at 12:07 PM, Marcos Mendonça wrote:
Hi
Not and regexp expert. But it seems to me that if you want to ignora
"B" then it should be
(A) | (^B)
Hope it helps!
On Wed, 9 Mar 2005 11:11:57 -0800, Mike Hall
<[EMAIL PROTECTED]> wrote:
I'm having some strange results using the "or" operator. In every
test
I do I'm matching both sides of the "|" metacharacter, not one or the
other as all documentation says it should be (the parser supposedly
scans left to right, using the first match it finds and ignoring the
rest). It should only go beyond the "|" if there was no match found
before it, no?
Correct me if I'm wrong, but your regex is saying "match dog, unless
it's followed by cat. if it is followed by cat there is no match on
this side of the "|" at which point we advance past it and look at the
alternative expression which says to match in front of cat."
However, if I run a .sub using your regex on a string contain both dog
and cat, both will be replaced.
A simple example will show what I mean:
import re
x = re.compile(r"(A) | (B)")
s = "X R A Y B E"
r = x.sub("13", s)
print r
X R 13Y13 E
...so unless I'm understanding it wrong, "B" is supposed to be ignored
if "A" is matched, yet I get both matched. I get the same result if I
put "A" and "B" within the same group.
On Mar 8, 2005, at 6:47 PM, Danny Yoo wrote:
Regular expressions are a little evil at times; here's what I think
you're
thinking of:
###
import re
pattern = re.compile(r"""dog(?!cat)
...| (?<=dogcat)""", re.VERBOSE)
pattern.match('dogman').start()
0
pattern.search('dogcatcher').start()
Hi Mike,
Gaaah, bad copy-and-paste. The example with 'dogcatcher' actually
does
come up with a result:
###
pattern.search('dogcatcher').start()
6
###
Sorry about that!
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Re: [Tutor] regular expression question
but yeah, it
seems you're expecting it to examine the string as a whole.
I guess I was, good point.
On Mar 9, 2005, at 12:28 PM, Liam Clarke wrote:
Actually, you should get that anyway...
"""
|
Alternation, or the ``or'' operator. If A and B are regular
expressions, A|B will match any string that matches either "A" or "B".
| has very low precedence in order to make it work reasonably when
you're alternating multi-character strings. Crow|Servo will match
either "Crow" or "Servo", not "Cro", a "w" or an "S", and "ervo".
"""
So, for each letter in that string, it's checking to see if any letter
matches 'A' or 'B' ...
the engine steps through one character at a time.
sorta like -
for letter in s:
if letter == 'A':
#Do some string stuff
elif letter == 'B':
#do some string stuff
i.e.
k = ['A','B', 'C', 'B']
for i in range(len(k)):
if k[i] == 'A' or k[i]=='B':
k[i]==13
print k
[13, 13, 'C', 13]
You can limit substitutions using an optional argument, but yeah, it
seems you're expecting it to examine the string as a whole.
Check out the example here -
http://www.amk.ca/python/howto/regex/
regex.html#SECTION00032
Also
http://www.regular-expressions.info/alternation.html
Regards,
Liam Clarke
On Thu, 10 Mar 2005 09:09:13 +1300, Liam Clarke <[EMAIL PROTECTED]>
wrote:
Hi Mike,
Do you get the same results for a search pattern of 'A|B'?
On Wed, 9 Mar 2005 11:11:57 -0800, Mike Hall
<[EMAIL PROTECTED]> wrote:
I'm having some strange results using the "or" operator. In every
test
I do I'm matching both sides of the "|" metacharacter, not one or the
other as all documentation says it should be (the parser supposedly
scans left to right, using the first match it finds and ignoring the
rest). It should only go beyond the "|" if there was no match found
before it, no?
Correct me if I'm wrong, but your regex is saying "match dog, unless
it's followed by cat. if it is followed by cat there is no match on
this side of the "|" at which point we advance past it and look at
the
alternative expression which says to match in front of cat."
However, if I run a .sub using your regex on a string contain both
dog
and cat, both will be replaced.
A simple example will show what I mean:
import re
x = re.compile(r"(A) | (B)")
s = "X R A Y B E"
r = x.sub("13", s)
print r
X R 13Y13 E
...so unless I'm understanding it wrong, "B" is supposed to be
ignored
if "A" is matched, yet I get both matched. I get the same result if
I
put "A" and "B" within the same group.
On Mar 8, 2005, at 6:47 PM, Danny Yoo wrote:
Regular expressions are a little evil at times; here's what I think
you're
thinking of:
###
import re
pattern = re.compile(r"""dog(?!cat)
...| (?<=dogcat)""", re.VERBOSE)
pattern.match('dogman').start()
0
pattern.search('dogcatcher').start()
Hi Mike,
Gaaah, bad copy-and-paste. The example with 'dogcatcher' actually
does
come up with a result:
###
pattern.search('dogcatcher').start()
6
###
Sorry about that!
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And with it comes the only basic human duty, to take the consequences.
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And with it comes the only basic human duty, to take the consequences.
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[Tutor] Code example
Trying to work on two programs that talk to each other - and just not getting the basics. Can someone please show me an example of two programs - you run one in console one - then when you run one in console two - it talks to the first program = sending a specific string instructing the first one to close. Once I have an example of that - I should be set. Thanks ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] stopping greedy matches
I'm having trouble getting re to stop matching after it's consumed what I want it to. Using this string as an example, the goal is to match "CAPS":
>>> s = "only the word in CAPS should be matched"
So let's say I want to specify when to begin my pattern by using a lookbehind:
>>> x = re.compile(r"(?<=\bin)") #this will simply match the spot in front of "in"
So that's straight forward, but let's say I don't want to use a lookahead to specify the end of my pattern, I simply want it to stop after it has combed over the word following "in". I would expect this to work, but it doesn't:
>>> x=re.compile(r"(?<=\bin).+\b") #this will consume everything past "in" all the way to the end of the string
In the above example I would think that the word boundary flag "\b" would indicate a stopping point. Is ".+\b" not saying, "keep matching characters until a word boundary has been reached"?
Even stranger are the results I get from:
>>> x=re.compile(r"(?<=\bin).+\s") #keep matching characters until a whitespace has been reached(?)
>>> r = x.sub("[EMAIL PROTECTED]", s)
>>> print r
only the word [EMAIL PROTECTED]
For some reason there it's decided to consume three words instead of one.
My question is simply this: after specifying a start point, how do I make a match stop after it has found one word, and one word only? As always, all help is appreciated.
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Re: [Tutor] stopping greedy matches
Liam, "re.compile("in (.*?)\b")" will not find any match in the example
string I provided. I have had little luck with these non-greedy
matchers.
I don't appear to have redemo.py on my system (on OSX), as an import
returns an error. I will look into finding this module, thanks for
pointing me towards it :)
On Mar 16, 2005, at 2:36 PM, Liam Clarke wrote:
x=re.compile(r"(?<=\bin).+\b")
Try
x = re.compile("in (.*?)\b")
.*? is a non-greedy matcher I believe.
Are you using python24/tools/scripts/redemo.py? Use that to test
regexes.
Regards,
Liam Clarke
On Wed, 16 Mar 2005 12:12:32 -0800, Mike Hall
<[EMAIL PROTECTED]> wrote:
I'm having trouble getting re to stop matching after it's consumed
what
I want it to. Using this string as an example, the goal is to match
"CAPS":
s = "only the word in CAPS should be matched"
So let's say I want to specify when to begin my pattern by using a
lookbehind:
x = re.compile(r"(?<=\bin)") #this will simply match the spot in
front of "in"
So that's straight forward, but let's say I don't want to use a
lookahead to specify the end of my pattern, I simply want it to stop
after it has combed over the word following "in". I would expect this
to work, but it doesn't:
x=re.compile(r"(?<=\bin).+\b") #this will consume everything past
"in" all the way to the end of the string
In the above example I would think that the word boundary flag "\b"
would indicate a stopping point. Is ".+\b" not saying, "keep matching
characters until a word boundary has been reached"?
Even stranger are the results I get from:
x=re.compile(r"(?<=\bin).+\s") #keep matching characters until a
whitespace has been reached(?)
r = x.sub("[EMAIL PROTECTED]", s)
print r
only the word [EMAIL PROTECTED]
For some reason there it's decided to consume three words instead of
one.
My question is simply this: after specifying a start point, how do I
make a match stop after it has found one word, and one word only? As
always, all help is appreciated.
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Re: [Tutor] stopping greedy matches
On Mar 16, 2005, at 5:32 PM, Sean Perry wrote: I know this does not directly help, but I have never successfully used \b in my regexs. I always end up writing something like foo\s+bar or something more intense. I've had luck with the boundary flag in relation to lookbehinds. For example, if I wanted to only match after "int" (and not "print") (?<=\bint) seems to work fine. I'm a bit frustrated at not being able to find a simple way to have a search stop after eating up one word. You'd think the \b would do it, but nope. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
Very nice sir. I'm interested in what you're doing here with the caret metacharacter. For one thing, why enclose it and the whitespace flag within a character class? Does this not traditionally mean you want to strip a metacharacter of it's special meaning? On Mar 16, 2005, at 8:00 PM, Christopher Weimann wrote: On 03/16/2005-12:12PM, Mike Hall wrote: I'm having trouble getting re to stop matching after it's consumed what I want it to. Using this string as an example, the goal is to match "CAPS": s = "only the word in CAPS should be matched" jet% python Python 2.4 (#2, Jan 5 2005, 15:59:52) [GCC 2.95.4 20020320 [FreeBSD]] on freebsd4 Type "help", "copyright", "credits" or "license" for more information. import re s = "only the word in CAPS should be matched" x=re.compile(r"\bin ([^\s]+)") x.findall(s) ['CAPS'] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
On Mar 16, 2005, at 8:32 PM, Kent Johnson wrote: "in (.*?)\b" will match against "in " because you use .* which will match an empty string. Try "in (.+?)\b" (or "(?<=\bin)..+?\b" )to require one character after the space. Another working example, excellent. I'm not too clear on why the back to back ".." in "(?<=\bin)..+?\b" )" makes the regex work, but it does. You can't import it, you have to run it from the command line. I don't know if it is installed under Mac OSX though. You might be interested in RegexPlor: http://python.net/~gherman/RegexPlor.html RegexPlor looks fantastic, will be downloading. Thanks. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
I don't have that script on my system, but I may put pythoncard on here and run it through that: http://pythoncard.sourceforge.net/samples/redemo.html Although regexPlor looks like it has the same functionality, so I may just go with that. Thanks. On Mar 17, 2005, at 1:31 AM, Michael Dunn wrote: As Kent said, redemo.py is a script that you run (e.g. from the command line), rather than something to import into the python interpretor. On my OSX machine it's located in the directory: /Applications/MacPython-2.3/Extras/Tools/scripts Cheers, Michael ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
On Mar 17, 2005, at 11:11 AM, Kent Johnson wrote: The first one matches the space after 'in'. Without it the .+? will match the single space, then \b matches the *start* of the next word. I think I understand. Basically the first dot advances the pattern forward in order to perform a non-greedy match on the following word.(?) Very nice. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
On Mar 18, 2005, at 9:27 AM, Christopher Weimann wrote: On 03/17/2005-10:15AM, Mike Hall wrote: Very nice sir. I'm interested in what you're doing here with the caret metacharacter. For one thing, why enclose it and the whitespace flag within a character class? A caret as the first charachter in a class is a negation. So this [^\s]+ means match one or more of any char that isn't whitespace. Ok, so the context of metas change within a class. That makes sense, but I'm unclear on the discrepancy below. Does this not traditionally mean you want to strip a metacharacter of it's special meaning? That would be \ Here's where I'm confused. From the Python docs: Special characters are not active inside sets. For example, [akm$] will match any of the characters "a", "k", "m", or "$"___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stopping greedy matches
On Mar 18, 2005, at 1:02 PM, Christopher Weimann wrote: On 03/18/2005-10:35AM, Mike Hall wrote: A caret as the first charachter in a class is a negation. So this [^\s]+ means match one or more of any char that isn't whitespace. Ok, so the context of metas change within a class. That makes sense, but I'm unclear on the discrepancy below. The ^ means begining of line EXCEPT inside a charachter class. There it means NOT for the entire class and it only means that if it is the very first charachter. I suppose you could consider that the there are two separate types of char classes. One is started with [ and the other is started with [^. Got it, thanks. That would be \ Here's where I'm confused. From the Python docs: Special characters are not active inside sets. For example, [akm$] will match any of the characters "a", "k", "m", or "$" And the next paragraphs says... You can match the characters not within a range by complementing the set. This is indicated by including a "^" as the first character of the class; "^" elsewhere will simply match the "^" character. For example, [^5] will match any character except "5". The sad thing is I have read that paragraph before (but obviously hadn't absorbed the significance). I'm new to this, it'll sink in. Thanks. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] .readlines() condensing multiple lines
Unless I'm mistaken .readlines() is supposed to return a list, where each index is a line from the file that was handed to it. Well I'm finding that it's putting more than one line of my file into a single list entry, and separating them with \r. Surely there's a way to have a one to one correlation between len(list) and the lines in the file the list was derived from...? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] .readlines() condensing multiple lines
Liam, "rU" worked like a charm. My previous syntax where the lines were condensing was:
fOpen = file(f, "r")
fRead = fTmp.readlines()
In this instance the size of fRead would not correspond to my line numbers. With fOpen = file(f, "rU") it now does. Thanks :)
On Mar 22, 2005, at 7:15 PM, Liam Clarke wrote:
From the docs -
In addition to the standard fopen() values mode may be 'U' or 'rU'.
If Python is built with universal newline support (the default) the
file is opened as a text file, but lines may be terminated by any of
'\n', the Unix end-of-line convention, '\r', the Macintosh convention
or '\r\n', the Windows convention. All of these external
representations are seen as '\n' by the Python program. If Python is
built without universal newline support mode 'U' is the same as normal
text mode. Note that file objects so opened also have an attribute
called newlines which has a value of None (if no newlines have yet
been seen), '\n', '\r', '\r\n', or a tuple containing all the newline
types seen.
So, try
x = file(myFile, 'rU').readlines()
Or try:
x = file(myFile, 'rU')
for line in x:
#do stuff
Let us know how that goes.
Regards,
Liam Clarke
PS
Worse come to worse, you could always do -
x = file(myFile, 'r').read()
listX = x.split('\r')
On Tue, 22 Mar 2005 17:10:43 -0800, Mike Hall
<[EMAIL PROTECTED]> wrote:
Unless I'm mistaken .readlines() is supposed to return a list, where
each index is a line from the file that was handed to it. Well I'm
finding that it's putting more than one line of my file into a single
list entry, and separating them with \r. Surely there's a way to have a
one to one correlation between len(list) and the lines in the file the
list was derived from...?
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Re: [Tutor] .readlines() condensing multiple lines
On Mar 23, 2005, at 12:53 AM, Alan Gauld wrote: Typically what happens is you view the file in an application that autrowraps long lines so it looks like multiple lines on screen but in fact it is one long line in the file. In that case Python will only see the single long line. I'm using subEthaEdit, which will autowrap long lines, but it also displays line numbers, so there's no doubt where one begins and ends :) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] .readlines() condensing multiple lines
On Mar 23, 2005, at 3:17 AM, Kent Johnson wrote: Anyway, Mike, it seems clear that your file has line endings in it which are not consistent with the default for your OS. If reading with universal newlines doesn't solve the problem, please let us know what OS you are running under and give more details about the data. Kent, reading universal did indeed solve my problem, but for the record I'm on OSX, and was reading from a standard plain text file. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python and Javascript
I'm curious on whether or not JavaScript and Python can talk to each other. Specifically, can a python function be called from within a JS function? Admittedly this is probably more of a JavaScript than Python question, but I'd love to know if anyone can at least point me in a direction to research this. -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and Javascript
Ryan, I should clarify that what I'd like to do here is unrelated to the web. I'm actually just interested in using a local html page as a simple gui to launch python calls. So a JS event handler, say a button click, would then call a JS function which inside of it would call a Python function while handing it arguments (say a path that the JS queried from a field in the html page.) That kind of thing. It seems like it should be possible, and hopefully easy, but I have no experience in calling Python functions from other languages so I'm just looking for some input on that. Thanks, -MH On Mar 25, 2005, at 12:01 PM, Ryan Davis wrote: Depends on your environment. If your js is on a webpage, you can have it make http calls to a python web service. Look for articles on XMLHttpRequest in javascript to see some examples. I don't know how else that could be done, but I imagine there are other ways. Thanks, Ryan -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hall Sent: Friday, March 25, 2005 2:18 PM To: tutor@python.org Subject: [Tutor] Python and Javascript I'm curious on whether or not JavaScript and Python can talk to each other. Specifically, can a python function be called from within a JS function? Admittedly this is probably more of a JavaScript than Python question, but I'd love to know if anyone can at least point me in a direction to research this. -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and Javascript
On Mar 25, 2005, at 12:41 PM, Alan Gauld wrote: If you are using WSH on Windows and have the Python active scripting installed then yes. Similarly if you use IE as web browser then it can be done in a web page too. I'm on OSX, and would be doing this through Safari most likely. -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and Javascript
On Mar 25, 2005, at 1:00 PM, Ryan Davis wrote: Ok, that explains a lot, but I don't know of any easy way to do have javascript talk to python. I can think of some horrible ways to do it, though. 1. Make a python web service running locally, and build up SOAP calls or HTTP posts to it. (same as I suggested earlier) 2. Use XUL and pyXPCOM to make a firefox extension that talks to python. This is probably much more of a pain in the ass than you want to do, but that's the only way I know of to directly call python functions from javascript. 3. Look into web framework Zope, that might have some of this plumbing done already. 4. Check out Sajax, http://www.modernmethod.com/sajax/, a framework to automate javascript calling your server-side functions. It was made for PHP, but looks to have a python version as well. All of those but #2 require you to set up some kind of server. Is there a reason it has to be an HTML page? If not, making a GUI might be an alternative that sidesteps this altogether. Yikes, that sounds pretty hairy. Maybe this kind of thing is not as straight forward as anticipated. Why HTML you say? Well I've been intrigued by Dashboard, which will be in the next OSX release. It allows you to create "widgets" which are essentially little html pages that do things. This got me thinking how I'd like to tie a small Python script I wrote into an html front end (ideally becoming a widget). It's looking like this may be trickier than anticipated. In any case, thanks. -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and Javascript
Danny, great reply. I have looked a bit at pyObjC, and it does indeed look cool. I was however hoping to bypass that route altogether and go for the simplicity (I thought) that came with the html/js route. Perhaps a cocoa bundle is the only way to get what I'm after. Thanks, -MH On Mar 25, 2005, at 1:40 PM, Danny Yoo wrote: Yikes, that sounds pretty hairy. Maybe this kind of thing is not as straight forward as anticipated. Why HTML you say? Well I've been intrigued by Dashboard, which will be in the next OSX release. It allows you to create "widgets" which are essentially little html pages that do things. This got me thinking how I'd like to tie a small Python script I wrote into an html front end (ideally becoming a widget). It's looking like this may be trickier than anticipated. In any case, thanks. Hi Mike, Interesting! You probably know about this already, but PyObjC allows you to write Mac OS X Cocoa applications in Python: http://pyobjc.sourceforge.net/ and this is a well tested bridge to make Python classes integrate into Cocoa applications. For example, http://www.pycs.net/bbum/2004/12/10/#200412101 mentions the use of PyObjC to make a Mac OS X screensaver. So it appears to embed very well. According to the documentation from Apple's Dashboard developer site, we can embed Cocoa bundles into Javascript (there's a brief mention of it under "Custom Code Plug-ins": http://developer.apple.com/macosx/tiger/dashboard.html So in theory, we should be able to inject a Pythonified Cocoa bundle into Dashboard, but then again, I've never tried this before. *grin* I haven't dived into doing Mac OS X development yet, but perhaps someone on the PyObjC list might be able to cook up a quick-and-dirty example of this for you. Try asking on their list and see if you get some useful responses: http://lists.sourceforge.net/lists/listinfo/pyobjc-dev Best of wishes to you! -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and Javascript
On Mar 25, 2005, at 4:53 PM, Alan Gauld wrote: intrigued by Dashboard, which will be in the next OSX release. It allows you to create "widgets" which are essentially little html pages There is an API for Dashboard and I'm pretty sure MacPython will support it - it covers most of the cocoa type stuff. You might be better checking out the Apple developer site for the Dashboard hooks and loooking at MacPythons options. Alan G. Alan, thanks for pointing me towards a few good approaches to look at. Going through some of the developer information I've come across mention of JS extensions which allow for system calls within a JS function, which should pretty much do what I want. Thanks, -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Launching a file browser
I looked over the global module index and the closest thing I could find relating to my os (osx) was EasyDialogs, which has a few functions pertaining to this, "AskFileForOpen()" being one. Calling any function within EasyDialogs however yields an Apple Event error: AE.AEInteractWithUser(5000) MacOS.Error: (-1713, 'no user interaction is allowed') I get the impression some of these "Mac" modules are more relevant to os 9 than 10(which is Unix), so maybe EasyDialogs is not the right choice here. Any suggestions are appreciated. -MH___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Launching a file browser
On Mar 28, 2005, at 4:24 PM, [EMAIL PROTECTED] wrote: So, you are writing a GUI app and you want some kind of open file dialog? Won't this depend on what toolkit you are using for your GUI? If you are using Tkinter (which should work on OS X, I think), try: import tkFileDialog f = tkFileDialog.askopenfilename() Check dir(tkFileDialog) for other functions. But other GUI toolkits will have their own functions. I my case the gui will be comprised of html and javascript, talking to python through system calls. I basically want to know if there's an equivalent of the "webbrowser()" module (which launches my browser) for file dialogs. This is what EasyDialogs should do, but does not. -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Launching a file browser
On Mar 31, 2005, at 12:21 AM, Max Noel wrote: It's been too long since I used Python on MacOSX, but IIRC you can't just run a Python GUI program from the shell. Or something like that...you should ask this one on the python-mac SIG mailing list: http://www.python.org/sigs/pythonmac-sig/ Kent You have to launch your script with pythonw, not with python. I'm unclear on why a command like webbrowser.open() will comfortably launch your default web browser (in my case Safari), but something as ubiquitous to an OS as a file browser has special needs to launch. Perhaps each application has custom written their file browser, and I'm assuming they are each essentially doing system calls to the same thing...? -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Launching a file browser
Ah, so it has to do with access to the window manager. That answers a lot, thanks. On Mar 31, 2005, at 4:09 PM, Max Noel wrote: On Apr 1, 2005, at 00:14, Mike Hall wrote: On Mar 31, 2005, at 12:21 AM, Max Noel wrote: It's been too long since I used Python on MacOSX, but IIRC you can't just run a Python GUI program from the shell. Or something like that...you should ask this one on the python-mac SIG mailing list: http://www.python.org/sigs/pythonmac-sig/ Kent You have to launch your script with pythonw, not with python. I'm unclear on why a command like webbrowser.open() will comfortably launch your default web browser (in my case Safari), but something as ubiquitous to an OS as a file browser has special needs to launch. Perhaps each application has custom written their file browser, and I'm assuming they are each essentially doing system calls to the same thing...? No, the reason for that, IIRC, is that for the program to be able to interact with the window manager, it has to be launched with pythonw. When the program starts to display stuff elsewhere than in STDOUT or STDERR, an application launch is somehow triggered (icon appears in the Dock), which for some reason enables the user to interact with the program. Launching a web browser requires no interaction whatsoever with the WM, and can therefore be done with python. Yes, the python/pythonw distinction in Mac OS X is stupid, I'll give you that. I don't even know why it exists in the first place. -- Max maxnoel_fr at yahoo dot fr -- ICQ #85274019 "Look at you hacker... A pathetic creature of meat and bone, panting and sweating as you run through my corridors... How can you challenge a perfect, immortal machine?" -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What is the best book to start?
Subject: Re: [Tutor] What is the best book to start? From: "Alan Gauld" <[EMAIL PROTECTED]> Date: Fri, 1 Apr 2005 09:05:16 +0100 To: "Hoffmann" <[EMAIL PROTECTED]>, To: "Hoffmann" <[EMAIL PROTECTED]>, I am starting to studying Python. I have some previous experience with C (beginner level). Probably the standard tutorial on the web site is the best place for you to start. "Learning Python" by Lutz & Ascher, And this is very good supporting material. "Python How to Program" by Deitel and others. And this is particularly good as an intro into the wider areas such as PyGame, XML/HTML GUIs and Network programming. The early chapters are done better IMHO by Lutz, aand the official tutor. Your next purchase should be either or both of: Python in a Nutshell - a great 'pocket' reference and Python Programming on Win32 - but only if you are using Windows of course! You have more than enough beginner material already. Alan G. I'd also try to fit in Dive Into Python [http://diveintopython.org/]. This book really got me hooked on Python. It assumes you know some programming. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Script (Python) for Zope
Hello, I am looking for a Python-script for Zope which counts the objects (files) in the current folder and all its subfolders, but I don't know how to implement this script. Can somebody help me, please? Or ist there a newsgroup/mailing list which can help me to find a solution for this problem? Thanks. Mike___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Launching a file browser
On Apr 1, 2005, at 4:12 PM, Jeff Shannon wrote:
At the OS level, these two actions are *completely* different. The
webbrowser module launches an entirely separate program in its own
independent process, where the "file browser" is opening a standard
dialog inside of the current process and dependent upon the current
process' message loop. (AFAIK, every GUI environment uses some sort
of message/event loop...)
I don't know Macs, but on Windows, the closest "file browser" parallel
to what the webbrowser module is doing would be
os.system("explorer.exe"), which launches a separate program in an
independent process. However, if you're trying to get the results of
the file selection back into your own app, you need to do the file
browsing within your own process (or explicitly use some form of
inter-process communication). In order to use a GUI file-browsing
dialog, you need to follow all the rules for a GUI program.
Thanks Jeff. This further clarifies it for me.
-MH
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Re: [Tutor] building strings of specific length
You can chop off anything past 72 characters with: s2 = s[:72] On Apr 4, 2005, at 7:04 AM, Vines, John (Civ, ARL/CISD) wrote: Hello. I have a question regarding strings. How do I format a string to be a specific length? For example I need 'string1' to be 72 characters long. Thanks for your time, John ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -MH ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Pychecker
I had a frustrating time yesterday with a small Python program I wrote. I wasn't getting the results I expected, so I sprinkled print statements through it. I wasn't getting anywhere. I tossed it into Komodo to see if the background syntax checker would pick up something I was missing. I then stepped through it and finally noticed that I had messed up a variable name. firstlist = [listItem[:12] for listItem in firstList] ^ when I meant firstList = [listItem[:12] for listItem in firstList] ^ doh! Later, I realized that I should have run it through Pychecker which would have picked it up immediately. With that experience of learning the hard way, I'd recommend that you always run your code through Pychecker just after editing it and before running it. In Perl, you can perl -c somehardtoreadperlprogram.pl that will just check the syntax. The above problem would have been caught in Perl since I always use strict. Is there a command line option in Python to do a Pychecker-like syntax check? I see a -t to check the tabs, but nothing to tell it to check the syntax but don't run it. If not, should Pychecker be part of the standard distribution? Am I missing something? Mike Go ahead and reply to me AND the list since I just get the digest. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Pychecker
Thanks Danny. I'll make sure I use pychecker so I don't shoot myself in the foot with not so easy to catch typos in variable names and syntax blunders. I might check with the pychecker devs to see if there's any effort to get it put into the standard distribution. I think it's too handy to not have it in the standard distribution. Mike Danny Yoo wrote: On Fri, 22 Apr 2005, Danny Yoo wrote: In Perl, you can perl -c somehardtoreadperlprogram.pl that will just check the syntax. The above problem would have been caught in Perl since I always use strict. Is there a command line option in Python to do a Pychecker-like syntax check? Hi Mike, Unfortunately, no, because there are some really funky things that one can do in Python that you can't do easily in Perl. Yikes. I should correct myself before I get someone angry at me. You can do this sort of late-binding stuff in Perl too, and in many other languages. (Java's reflection mechanism is another kind of late-binding mechanism, for example.) But Python makes it extraordinarly easy --- perhaps too much so. *grin* ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Use Strict or Use Warnings was ( Lists of files)
> > > Subject: > Re: [Tutor] Lists of files > From: > William O'Higgins <[EMAIL PROTECTED]> > Date: > Mon, 16 May 2005 15:50:37 -0400 > > [...] > > One last thing - is there an equivalent of the "use strict" and "use > warnings" pragmas in Python? Thanks. The closest thing I've found is PyChecker. It's kind of like perl -c hardtoreadperlscript.pl http://pychecker.sourceforge.net/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python debugger under Tiger?
Does anyone know of a Python debugger that will run under OSX 10.4? The Eric debugger was looked at, but it's highly unstable under Tiger. Thanks.-MH___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python debugger under Tiger?
I should of specified that I'm looking for an IDE with full debugging. Basically something like Xcode, but with Python support. On May 18, 2005, at 3:10 PM, [EMAIL PROTECTED] wrote: > Quoting Mike Hall <[EMAIL PROTECTED]>: > > >> Does anyone know of a Python debugger that will run under OSX 10.4? >> The Eric debugger was looked at, but it's highly unstable under >> Tiger. Thanks. >> > > pdb should work :-) > > -- > John. > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python debugger under Tiger?
> Subject: > Re: [Tutor] Python debugger under Tiger? > From: > Mike Hall <[EMAIL PROTECTED]> > Date: > Wed, 18 May 2005 15:54:18 -0700 > To: > [EMAIL PROTECTED] > > To: > [EMAIL PROTECTED] > CC: > tutor@python.org > > > I should of specified that I'm looking for an IDE with full debugging. > Basically something like Xcode, but with Python support. > > > On May 18, 2005, at 3:10 PM, [EMAIL PROTECTED] wrote: > >> Quoting Mike Hall <[EMAIL PROTECTED]>: >> >> >>> Does anyone know of a Python debugger that will run under OSX 10.4? >>> The Eric debugger was looked at, but it's highly unstable under >>> Tiger. Thanks. >>> >> >> pdb should work :-) >> >> -- >> John. >> ___ >> Tutor maillist - Tutor@python.org >> http://mail.python.org/mailman/listinfo/tutor >> It's too bad that Activestate doesn't have a version of Komodo that runs under OS X. They have Windows, Linux, and Solaris, but not OS X. I wonder if Eclipse using PyDev has visual debugging/stepping/watching that you are looking for? You might want to ask on the python mac mail list http://mail.python.org/mailman/listinfo/pythonmac-sig Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python debugger under Tiger?
Great recommendation, thanks.-MHOn May 18, 2005, at 8:12 PM, Lee Cullens wrote:Mike,You may not be looking for a commercial IDE, but I am very happy with WingIDE and using it with Tiger.Lee COn May 18, 2005, at 6:54 PM, Mike Hall wrote: I should of specified that I'm looking for an IDE with fulldebugging. Basically something like Xcode, but with Python support.On May 18, 2005, at 3:10 PM, [EMAIL PROTECTED] wrote: Quoting Mike Hall <[EMAIL PROTECTED]>: Does anyone know of a Python debugger that will run under OSX 10.4?The Eric debugger was looked at, but it's highly unstable underTiger. Thanks. pdb should work :-)-- John.___Tutor maillist - Tutor@python.orghttp://mail.python.org/mailman/listinfo/tutor ___Tutor maillist - Tutor@python.orghttp://mail.python.org/mailman/listinfo/tutor ___Tutor maillist - Tutor@python.orghttp://mail.python.org/mailman/listinfo/tutor___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Filtering Spreadsheet Data
> Subject: > [Tutor] Filtering Spreadsheet Data > From: > Luke Jordan <[EMAIL PROTECTED]> > Date: > Mon, 23 May 2005 15:30:33 -0500 > To: > tutor@python.org > > To: > tutor@python.org > > > Hi All, > > I have several frighteningly cumbersome reports to review at my new > job. I would like to write a python program to help me with my > analysis. The goal of the program is to filter out information that > doesn't meet certain requirements and print relevant results back to > a legible report that I can do detailed research and analysis on. The > reports come to me in Excel format. > > I have a solid understanding of basic programming. > > Any guidance/advice/starting points would be greatly appreciated. > > Thanks! > > Luke > Excel has some nice database-like queries itself. Take a look at Advanced Filter in Help. You can essentially query a worksheet and even send the results to a different worksheet. I'd imagine that once you got the query working, you could automate it using VBA or Python. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Planning a program with algorithm?
> > > Subject: > [Tutor] Planning a program with algorithm? > From: > ". ," <[EMAIL PROTECTED]> > Date: > Sun, 29 May 2005 19:21:33 + > To: > tutor@python.org > > To: > tutor@python.org > > > I know how to write a prog. > > But, I don't know how to plan a prog. with algorithm. [...] > > Any useful advice for algorithm would be appreciated. > > Thanks. You might want to take a look at the book Code Complete. It really covers the nuts and bolts of software construction. http://www.cc2e.com/ Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] question about "hiding" a function/method in a class
I haven't done much OO in Python yet. For various web apps we write, we usually
write up a DB schema in a spreadsheet. Then we write the sql script that would
create the tables in the database. I thought it would be neat to save the
spreadsheet as a csv file and have python write the sql script. So I started to
write the Python program.
-
#!/usr/bin/env python
"""
SQLGEN takes a csv file of a database schema and writes the sql script that
will
create the
tables and fields in the database
Mike Hansen Jun 2005
"""
class DBField(object):
def __init__(self, fieldName):
self.fieldName = fieldName
self.type = ""
self.size = 0
self.notNull = False
self.unique = False
self.references = ""
self.default = ""
def printField(self):
self.fieldStr = "%s %s" %(self.fieldName, self.type)
if self.size > 0:
self.fieldStr = "%s(%s)" %(self.fieldStr, self.size)
if self.notNull:
self.fieldStr = "%s NOT NULL" %self.fieldStr
if self.unique:
self.fieldStr = "%s UNIQUE" %self.fieldStr
if self.default:
self.fieldStr = "%s DEFAULT %s" %(self.fieldStr, self.default)
# if self.references
return self.fieldStr
def __getattr__(self, attrname):
if attrname == "fieldStr":
return self.printField()
else:
raise AttributeError, attrname
def main():
pass
def test():
areas = DBField("area")
areas.type = "VARCHAR"
areas.size = 80
areas.notNull = True
areas.unique = True
print areas.fieldStr
stuff = DBField("stuff")
stuff.type = "INTEGER"
stuff.notNull = True
print stuff.fieldStr
if __name__ == "__main__":
# main()
test()
---
I was wondering if I should "hide" the printField function, so I or someone
else
won't do x.printField() in the main program but use the x.fieldStr attribute.
If
so, how would I do that, def __printField(self):? How would I call it from
__getattr__? I know I'm not really hiding it ;just mangling it. On the other
hand, I guess it doesn't matter. What do you think?
Mike
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Re: [Tutor] question about "hiding" a function/method in a class
> Subject: > Re: [Tutor] question about "hiding" a function/method in a class > From: > Kent Johnson <[EMAIL PROTECTED]> > Date: > Fri, 03 Jun 2005 09:45:20 -0400 > > CC: > tutor@python.org > > > Mike Hansen wrote: > >> class DBField(object): >> def __init__(self, fieldName): >> self.fieldName = fieldName >> self.type = "" >> self.size = 0 >> self.notNull = False >> self.unique = False >> self.references = "" >> self.default = "" >> >> def printField(self): >> self.fieldStr = "%s %s" %(self.fieldName, self.type) >> if self.size > 0: >> self.fieldStr = "%s(%s)" %(self.fieldStr, self.size) >> if self.notNull: >> self.fieldStr = "%s NOT NULL" %self.fieldStr >> if self.unique: >> self.fieldStr = "%s UNIQUE" %self.fieldStr >> if self.default: >> self.fieldStr = "%s DEFAULT %s" %(self.fieldStr, >> self.default) >> # if self.references >> return self.fieldStr >> >> def __getattr__(self, attrname): >> if attrname == "fieldStr": >> return self.printField() >> else: >> raise AttributeError, attrname >> --- >> >> I was wondering if I should "hide" the printField function, so I or >> someone else won't do x.printField() in the main program but use the >> x.fieldStr attribute. If so, how would I do that, def >> __printField(self):? How would I call it from __getattr__? I know I'm >> not really hiding it ;just mangling it. On the other hand, I guess it >> doesn't matter. What do you think? > > > Python programmers tend to take the attitude "We're all adults here" > towards things like this. We use conventions to put warning labels where > appropriate, then trust the client programmer to do what is right for them. > > So, to answer your direct question, yes, you could call the method > __printField(), which nominally hides the name from other modules, or > _printField(), which by convention marks the method as for internal use > only (a warning label). You would call it from __getattr__() as > __printField() or _printField(). (A quick experiment would have answered > this part of the question.) > > However, for your particular usage of dynamically computing the value of > a field, there is a better way to do this - use a property. > > class DBField(object): > def _printField(self): >... > > # Create a read-only fieldStr attribute whose value is computed by > _printField() > fieldStr = property(_printField) > > # Remove _printField so it can't be called directly > del _printField > > > A few more comments: > - The name _printField() is a bit of a misnomer since nothing is > printed; _getFieldStr() might be a better name. > - Another, simpler way to do this is to define __str__() instead of > _printField() and fieldStr; then clients can just call str(field) to get > the string representation. This will work well if you don't need any > other string representation. > - Of course you could also just define getFieldStr() and forget about > the fieldStr attribute entirely. This is also a very simple, > straightforward approach. > > Kent > Doh, I forgot about properties! If I had read a little more in Learning Python on the page with __getattr__, I might have noticed properties. I might go with the "Simple is better than complex" approach using getFieldStr(). I agree that printField wasn't sounding like a good name. Thanks for the comments. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] question about "hiding" a function/method in a class
Alan G wrote: >>I haven't done much OO in Python yet. For various web apps we write, > > we usually > >>write up a DB schema in a spreadsheet. > > > Wow! How exactly do you represent a schema in a spreadsheet? > I confess I cannot conceive of such a thing. Can you send a > representative sample to illustrate? > Maybe it's not a "schema" exactly. |Table Name|Fields |Type |Size|Primary Key|Not Null|Unique|Foreign Key| ... |areas |area_id |serial ||x |x |x | | | |area|varchar|80 | |x |x | | | |enabled |boolean|| |x | | | |'s represent each cell. It's just a way to organize your thoughts, and have something a little more readable than an SQ script for a DB schema. There's been less than 20 tables in a database for most of these applications that we write. It's clear enough to see the relations(there's another column references). > >>create the tables in the database. I thought it would be neat to > > save the > >>spreadsheet as a csv file and have python write the sql script. So I > > started to > >>write the Python program. > > > You do know that there are lots of ERD programs that allow you to draw > the schema as an ERD and generate the SQL DDL directly? In fact even > Visio > can do that. > > Alan G. > Can you point me to some Open Source/Free ERD programs that work with Postgre?(I'll google after I send this message.) I'd certainly would like to look at ways to do this better. Last time I looked at Visio which was Visio 2000, the ERD stuff cost extra and was very unstable. Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Controlling Where My Program Ends
> Subject: > Re: [Tutor] Controlling Where My Program Ends > From: > Don Parris <[EMAIL PROTECTED]> > Date: > Tue, 14 Jun 2005 23:03:59 -0400 > To: > tutor@python.org > > To: > tutor@python.org > > > On Wed, 15 Jun 2005 00:59:24 - > "DC Parris" <[EMAIL PROTECTED]> wrote: > > >>Never mind. I found it - sys.exit() >> >>Sorry to have wasted the bandwidth/time. >>-- > > > This was in reference to a post about exiting from a program. I couldn't > figure out why my program wouldn't let me exit from within a sub-menu of the > console interface. Since my webmail client goofed up the "from" header, it > never showed up, and I've cancelled it to avoid wasting everyone's time > further. I found sys.exit() in the library reference, which allows me to do > what I want. > > Don > If you use the if __name__ == '__main__': idiom, then you can just use return instead of sys.exit() def main(): lotsa interesting python code if somethinorother: # sys.exit() return more interesting python code if __name__ == '__main__': main() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] loading an image into a Postgre database
I'm having trouble loading an image into a Postgre database. The code is below
as well as the traceback in the apache log. Is something up with my
sqlStatement? Do I need to use something other than %s? How can I avoid that
type error?
Thanks,
Mike
#! /usr/bin/env python
import cgi
from pyPgSQL import PgSQL
# from pyPgSQL.PgSQL import PgBytea
def main():
form = cgi.FieldStorage()
if form.has_key("filename"):
item = form["filename"]
imageName = form["imagename"]
if item.file:
data = item.file.read()
data_obj = PgSQL.PgBytea(data)
connectdb =PgSQL.connect('server:port:database:username:password')
cur = connectdb.cursor()
sqlStatement = """INSERT INTO images (image)
VALUES (%s);
""" % (data_obj)
cur.execute(sqlStatement)
cur.close()
connectdb.commit()
print "Content-type: text/html\n\n"
print "image loaded"
if __name__ == '__main__':
main()
Traceback (most recent call last):
File "/var/www/htdocs/mtest/imagetest.py", line 28, in ?
main()
File "/var/www/htdocs/mtest/imagetest.py", line 20, in main
cur.execute(sqlStatement)
File "/usr/lib/python2.3/site-packages/pyPgSQL/PgSQL.py", line 3038, in
execute
self.res = self.conn.conn.query(_qstr)
TypeError: query() argument 1 must be string without null bytes, not str
[Tue Jun 21 14:34:46 2005] [error] [client 10.95.100.11] Premature end of
script
headers: /var/www/htdocs/mtest/imagetest.py10.95.100.11] Premature end of script
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Re: [Tutor] loading an image into a Postgre database
Thanks Danny. That did the trick. I think I had thought about putting the variables in the execute statement, but I didn't run across any examples. I'll need to read the DB API 2.0 docs some more. Mike Danny Yoo wrote: >>Thankfully, you don't have to change much to fix the formatting bug. The >>only thing you'll need to do is let the SQL cursor do the value formatting >>for you: >> >>## >>sqlStatement = """INSERT INTO images (image) >> VALUES (%s); >>cur.execute(sqlStatement, (data_obj)) >>## > > > > Hi Mike, > > > Gaaa. I was a little sloppy there, wasn't I? Let me fix that: > > ## > sqlStatement = """INSERT INTO images (image) > VALUES (%s);""" > cur.execute(sqlStatement, (data_obj,)) > ## > > > My apologies! > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] getting an image out of a postgre database
Well, I've managed to get an image into a postgre database, but now I'm having
trouble getting it out.
#! /usr/bin/env python
from pyPgSQL import PgSQL
def main():
connectdb = PgSQL.connect('server:port:database:username:password')
cur = connectdb.cursor()
sqlStatement = """SELECT image from images where image_id = 1"""
cur.execute(sqlStatement)
rec = cur.fetchone()
# TODO make temp file name include image_id.
# TODO use tempfile module
# TODO clean up old temp files
tempFileName = "1.jpg"
tempFile = open(tempFileName, "w")
tempFile.write(rec[0])
tempFile.close()
cur.close()
print "Content-type: text/html\n\n"
print """"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
http://www.w3.org/1999/xhtml";>
"""
if __name__ == '__main__':
main()
Traceback (most recent call last):
File "./dispimage.py", line 39, in ?
main()
File "./dispimage.py", line 16, in main
tempFile.write(rec[0])
TypeError: argument 1 must be string or read-only character buffer, not instance
So, rec[0] is an instance, but an instance of what? Since I needed to use the
PgSQL.PgBytea method on the image before inserting it into the database, do I
need to use a similar method to undo what PgBytea did to it, or am I
incorrectly
writing this binary data? I tried PgSQL.PgUnQuoteBytea(rec[0]), but that didn't
work.
If this is more appropriate for another mail list, let me know.
Mike
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