His problem was composing four functions, each with a small error. The first
two applications work well enough, but there is a about a percent error in
the third composition. The big source of error is f(x+h)-f(x). Subtracting
two floating point numbers that are nearly equal is a known source
Thanks for your answer but can you give me reasons for same.
On Tue, Apr 21, 2009 at 2:38 AM, Tim Michelsen
wrote:
> I can recommend you web2py:
> http://www.web2py.com/
>
> It has been designed for didactical needs and has a low learning curve.
>
> Look at the manual extarct for an idea:
> Free
this worked for me fine.
#Author - Chris Castillo
#Created 4/19/09
#Program 6
import time
#Open and read text file with student information
gradesfile = open("grades.dat", "r")
time_acc = time.asctime()
#Ask user for student ID to lookup student information
sought_id = raw_input("Please enter a
On Mon, Apr 20, 2009 at 7:53 PM, Matt wrote:
> I'm trying to calculate the derivative of a function in Python like so:
>
> def D5(func,h=1e-5):
> ""' Return derivative of function func'''
> def df(x): return (func(x+h)-func(x))/h
> df.__name__ = func.__name__ + '_dx'
> return df
You should look up "numerical methods" or similar. There are ways of
rearranging your calculations to minimize the loss of precision. You could
also try a numerical/scientific library like GMP (for integers or rational
numbers). I don't know of any (Python) library for extended precision
fl
I'm trying to calculate the derivative of a function in Python like so:
def D5(func,h=1e-5):
""' Return derivative of function func'''
def df(x):return (func(x+h)-func(x))/h
df.__name__ = func.__name__ + '_dx'
return df
However, I run into the problem of limited float precisio
>
> xrange was a kludge to improve on range's memory efficiency
> but it is a horrible name that obscures the code.
>
> Also it does not exist in v3 so if you use it you will need to change
> the code for v3. It is as well to be as consistent with v3 as possible
> IMHO
>
> Alan G
I have felt th
I've solved the problem by passing on the work of deciding when to commit to
client code. This isn't ideal but it will do what is necessary and
unfortunately I don't have any more time to dedicate to this. I hate not being
able to find a reasonable workaround :/.
--
~Matthew Strax-Haber
National
Can you give us a simple description of what you are trying to do? And
if you can post in plain text instead of HTML that would be helpful.
Maybe this will give you some ideas - you can trap the control-D and
do your cleanup:
http://openbookproject.net/pybiblio/tips/wilson/simpleExceptions.php
Ke
Sorry about that. Hopefully this is better:
In operator:
def __init__(self, path, saveDB=True, cleanUp=True):
'''Constructor'''
## Calculate filesystem paths
self.WORK_DIR= path + '.tmp'
DB_PATH= path + '.xml'
self.SAVE_DB= saveDB## finish(): Delete unnecessa
"Matt" wrote
As an aside, why use range rather than xrange? I was under the impression
that xrange is a generator and therefore more memory efficient.
xrange was a kludge to improve on range's memory efficiency
but it is a horrible name that obscures the code.
Also it does not exist in v3 s
On Mon, Apr 20, 2009 at 1:17 PM, Martin Walsh wrote:
> from subprocess import Popen, PIPE
>
> openssl_cmd = 'openssl s_client -ssl2 -connect somewebsitename:443'
> openssl = Popen(
> openssl_cmd, shell=True, stdout=PIPE, stderr=PIPE, stdin=PIPE
> )
> stdout, stderr = openssl.communicate('GET /')
I can recommend you web2py:
http://www.web2py.com/
It has been designed for didactical needs and has a low learning curve.
Look at the manual extarct for an idea:
Free manual chapters -
http://mdp.cti.depaul.edu/examples/static/web2py_manual_cut.pdf
or check the docs:
http://www.web2py.com/ex
Forwarding to the list. Matt, perhaps you can repost in plain text, my
mail client seems to have mangled your source ...
Strax-Haber, Matthew (LARC-D320) wrote:
>> *From: *Martin Walsh
>>
>> The environment available to __del__ methods during program termination
>> is wonky, and apparently not ve
On Mon, Apr 20, 2009 at 10:46 AM, Matt wrote:
> Running this interactively, if you finish off with 'del db', it exits fine
> and creates a skeleton xml file called 'db.xml' with text ''.
> However, if you instead CTRL-D, it throws at exception while quitting and
> then leaves an empty 'db.xml' whi
Matt wrote:
> Hey everyone,
>
> I'm hoping someone here can help me solve an odd problem (bug?). I'm
> having trouble with string encoding, object deletion, and the xml.etree
> library. If this isn't the right list to be posting this question,
> please let me know. I'm new to Python and don't know
On Mon, Apr 20, 2009 at 2:13 PM, ALAN GAULD wrote:
> I mean you need a source installation not a binary one, it is looking for
> python.h
> which is one of the C header files in the Python source code.
>
> Alan Gauld
> Author of the Learn To Program website
> http://www.alan-g.me.uk/
>
>
> ---
I mean you need a source installation not a binary one, it is looking for
python.h
which is one of the C header files in the Python source code.
Alan Gauld
Author of the Learn To Program website
http://www.alan-g.me.uk/
From: Emad Nawfal (عماد نوفل)
To: Al
> From: spir
> Date: Mon, 20 Apr 2009 12:22:59 -0500
> To: Python Tutor
> Subject: Re: [Tutor] String Encoding problem
>
> Le Mon, 20 Apr 2009 10:46:47 -0400,
> Matt s'exprima ainsi:
>
>> Hey everyone,
>>
>> I'm hoping someone here can help me solve an odd prob
2009/4/20 Alan Gauld
>
> "Emad Nawfal (عماد نوفل)" wrote
>
> e...@emad-desktop:~/Desktop/py-editdist-0.3$ python setup.py build
>> running build
>> gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
>> editdist.c:22:20: error: Python.h: No such file or directory
>>
>
> Looks like y
On Mon, Apr 20, 2009 at 12:34 PM, Matt
> wrote:
> Thank you. Func is in fact a call to an external non-python program. =]
> Therefore, the loop must actually be mindlessly done. My question, however,
> has been answered.
> As an aside, why use range rather than xrange? I was under the impression
Le Mon, 20 Apr 2009 09:07:01 -0700,
"Dinesh B Vadhia" s'exprima ainsi:
> t = """abc DEF ghi jkl MNO pqr"""
>
> ... pickup all text between the tags and and replace with
> another piece of text.
>
> I tried
>
> t = re.sub(r"\[A-Za-z0-9]\", "DBV", t)
>
> ... but it doesn't work.
You need:
"Dinesh B Vadhia" wrote in
... pickup all text between the tags and and replace with
another piece of text.
How do you do this with re?
Preferably you don't, use an HTML parser. It is both easier and
more reliable since it is almost impossible to handle all HTML
constructs reliably usin
Thank you. Func is in fact a call to an external non-python program. =]
Therefore, the loop must actually be mindlessly done. My question, however,
has been answered.
As an aside, why use range rather than xrange? I was under the impression
that xrange is a generator and therefore more memory effic
"Emad Nawfal (عماد نوفل)" wrote
e...@emad-desktop:~/Desktop/py-editdist-0.3$ python setup.py build
running build
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
editdist.c:22:20: error: Python.h: No such file or directory
Looks like you need the Python source code installed,
"Matt" wrote
Let's say I want to run func 10 times Is there a more pythonic way to do
it
than this:
for i in xrange(10):
func()
Yes, use range() rather than xrange :-)
But more seriously, as others have pointed out, if func() is well
written then calling it ten times will have no e
Le Mon, 20 Apr 2009 10:46:47 -0400,
Matt s'exprima ainsi:
> Hey everyone,
>
> I'm hoping someone here can help me solve an odd problem (bug?). I'm having
> trouble with string encoding, object deletion, and the xml.etree library. If
> this isn't the right list to be posting this question, please
Kayvan Sarikhani wrote:
> Tutors,
>
> I'm working on a script to verify whether a particular website
> supports SSLv2 via the following:
>
> --- BEGIN ---
> #!/usr/bin/python
> import os, re
>
> checkssl_out = open('checkssl.txt','w')
>
> website = 'somewebsitename'
> sslv2 = 'Protocol : SSL
Le Mon, 20 Apr 2009 17:26:30 +0200,
"A.T.Hofkamp" s'exprima ainsi:
> Matt wrote:
> > Hey everyone,
> >
> > First post to this list. I hope I'm doing it right.
> >
> > Let's say I want to run func 10 times Is there a more pythonic way to do
> > it than this: for i in xrange(10):
> > func()
>
>
Hi Tutors,
I tried to install this edit distance module but failed:
http://www.mindrot.org/projects/py-editdist/
I'm running Ubuntu Linux. The error message is below. Your help appreciated
e...@emad-desktop:~/Desktop/py-editdist-0.3$ python setup.py build
running build
running build_ext
building
Hi! I want to parse text and pickup sections. For example, from the text:
t = """abc DEF ghi jkl MNO pqr"""
... pickup all text between the tags and and replace with another
piece of text.
I tried
t = re.sub(r"\[A-Za-z0-9]\", "DBV", t)
... but it doesn't work.
How do you do this with
Matt wrote:
Hey everyone,
First post to this list. I hope I'm doing it right.
Let's say I want to run func 10 times Is there a more pythonic way to do it
than this:
for i in xrange(10):
func()
no, that looks fine for your requirement.
What may be a bit weird here is the requirement to run
On Mon, Apr 20, 2009 at 8:48 AM, Matt
> wrote:
> Hey everyone,
>
> First post to this list. I hope I'm doing it right.
>
> Let's say I want to run func 10 times Is there a more pythonic way to do it
> than this:
> for i in xrange(10):
> func()
AFAIK that's the most pythonic way to do it... and
Hey everyone,
I'm hoping someone here can help me solve an odd problem (bug?). I'm having
trouble with string encoding, object deletion, and the xml.etree library. If
this isn't the right list to be posting this question, please let me know.
I'm new to Python and don't know of any other "help me"
Hey everyone,
First post to this list. I hope I'm doing it right.
Let's say I want to run func 10 times Is there a more pythonic way to do it
than this:
for i in xrange(10):
func()
Thanks.
___
Tutor maillist - Tutor@python.org
http://mail.python.org
Thanks for your elaborate reply.
On Mon, Apr 20, 2009 at 12:47 AM, Scott SA wrote:
> On Apr 19, 2009, at 4:52 AM, vishwajeet singh wrote:
>
> This is not to flame any war; I just wanted to know the key features to
>> consider among the two web frame works.
>>
>> What advantage and disadvantages
Hello Denis,
Please find more details , Use cases about the Built-in in the following
book under the
*Chapter 9* - Oops, Creating modules.
*Book Name :* Python Programming for the Absolute Beginner
*Author:* Michael Dawson
Ta,
Paddy
2009/4/20 spir
> Hello,
>
> Just discovered vars(). Looking
"Scott SA" wrote
May have been a bad assumption on my part as I envisioned pickling a
dict. and that just got too complicated.
A pickled dict?
That would be a shelve mebbe?
PS. My email is acting up, did my prev. message actually make it to
the list?
Yes, I saw it just after sending m
Hello,
Just discovered vars(). Looking for the reasons and use cases that led to
introduce this builtin. But could not find any reference.
Any pointer/clue?
Denis
PS: same about all() and any() -- but here I found some literature... in french:
fr.wikipedia.org/wiki/Python_(langage)
--
la v
On Apr 20, 2009, at 12:59 AM, Alan Gauld wrote:
You might want to store the data in a dictionary keyed by ID number?
I had thought of suggesting this, but it appeared that the OP was
going to re-iterate the file each time he wished to query the CSV.
May have been a bad assumption on my par
Le Mon, 20 Apr 2009 07:59:15 +0100,
"Alan Gauld" s'exprima ainsi:
> So I'd change the structure to be like this(pseudo code)
>
> students = dict() # empty dict
> for line in gradesfile:
> line = line.split(',')
> s = Student()
> s.id = line[0]
> s.lastname = line[1]
> etc...
Le Mon, 20 Apr 2009 07:59:15 +0100,
"Alan Gauld" s'exprima ainsi:
> > #Open and read text file
> >
> > gradesfile = open("grades.dat", "r"
> > for lines in gradesfile:
> >lines = lines.split(",")
> >identifier = lines[0]
> >lastname = lines[1]
> >firstname = lines[2]
> >major
"Chris Castillo" wrote
I am trying to open a text file and read multiple lines containing the
following:
745777686,Alam,Gaus,CIS,15,30,25,15,5,31,15,48,70,97
888209279,Anderson,Judy,Math Ed,14,30,30,13,11,30,16,18,58,72
You could use the CSV module for this, although a basic
for loop is fin
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