Re: [Tutor] __init__.py
HI Joseph, > I've seen many (python) "plugins" (some located in site-packages [windows > here]) with the name __init__.py. init.py is the file that controls the behaviour of python packages - that is collections of modules used as a single entity. Read the python docs for the fine detail, but essentially the init file often imports functions or classes that the package designer wants to appear as top level(in the package as opposed to being in a sub module). Also initialisation of package variables such as constants can be done there. HTH, Alan G Author of the Learn to Program web tutor http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Checking and showing all errors before of exit
Kent Johnson wrote: > >>Is there any way of checking all possible errors, show you all error >>messages, and then exit. > > I don't understand your question. Can you give an example of what you would > like to do? > The idea was check all exceptions before of exit. I made it :) flag_error = False for x in [dir_lo, dir_k, dir_x]: try: os.listdir(x) except OSError, err_o: flag_error = True print "Error! %s: %r" % (err_o.strerror, err_o.filename) if flag_error: sys.exit() Now, I have a dudes: 1) Is it necessary use .exit() with some value (as 1) for indicate that has been an error? 2) With .listdir() the exception can checks if the directory exist, but how check if there are files in that directory too? Thanks in advance! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Checking and showing all errors before of exit
Jonas Melian wrote: > Kent Johnson wrote: > >>>Is there any way of checking all possible errors, show you all error >>>messages, and then exit. >> >>I don't understand your question. Can you give an example of what you would >>like to do? >> > > The idea was check all exceptions before of exit. I made it :) > > flag_error = False > for x in [dir_lo, dir_k, dir_x]: > try: > os.listdir(x) > except OSError, err_o: > flag_error = True > print "Error! %s: %r" % (err_o.strerror, err_o.filename) > > if flag_error: > sys.exit() > > Now, I have a dudes: > > 1) Is it necessary use .exit() with some value (as 1) for indicate that > has been an error? The argument to sys.exit() is the exit status of your program. exit() is the same as exit(0). If you want to signal to other programs that you exited with an error then use a different value. > > 2) With .listdir() the exception can checks if the directory exist, but > how check if there are files in that directory too? Look at the result of the call to listdir(), e.g. if len(os.listdir(x)) == 0: flag_error = True print "Error: Empty directory" Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Davlib and HTTP Authentication
Would anyone on the list with some knowledge of working with
davlib.py (http://www.lyra.org/greg/python/) be able to advise
regarding use of the library with a Dav server (apache2 with mod_dav)
that is configured to require HTTP Basic Authentication?
Specifically, I have calls for davlib.put, which look like:
mydav.put(myurl,mydata,None,None,{"Authorization":"Basic %s"%auth})
where davlib.put is defined as:
def put(self, url, contents, content_type=None,
content_enc=None, extra_hdrs={ }):
The put functions work fine, as do some other basic Dav functions
which are defined in a similar manner
.
However, I would like to manipulate the properties of files on the
server. The "user" function defined in davlib is:
def setprops(self, url, *xmlprops, **props):
which doesn't appear to permit the addition of extra_hdrs as before
in order to carry out HTTP Basic Authentication. There is, however, a
proppatch function defined as:
def proppatch(self, url, body, extra_hdrs={ }):
which does not have some of the XML parsing and formatting that
occurs in setprops.
I am wondering whether I should be implementing my own setprops
function, perhaps inheriting and extending from the davlib class,
whether I should be writing my own setprops function from scratch, or
whether I should just use the proppatch function. Davlib.py isn't
very well documented.
So in generic terms, the question is "I am using a library but the
function doesn't appear to do what I need it to, what's the best way
to proceed?".
Many thanks,
--
rik
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[Tutor] clock.py
clock.py,problem is to get the last two digits to be random.her's what i
tried
from time import time,ctime
prev_time = ""
while(1):
the_time = ctime()
if (prev_time != the_time):
print "The time is :",ctime(time())
prev_time = the_time
guess = 0
number = 1-60
while guess != number:
guess = input ("Guess the last two digits:")
if guess > number:
print "Too high"
elif guess < number:
print "Too low"
print "Just right"
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Re: [Tutor] clock.py
Feziwe Mpondo wrote:
>clock.py,problem is to get the last two digits to be random.her's what i
>tried
>from time import time,ctime
>prev_time = ""
>while(1):
>the_time = ctime()
>if (prev_time != the_time):
> print "The time is :",ctime(time())
>prev_time = the_time
>guess = 0
>number = 1-60
>while guess != number:
>guess = input ("Guess the last two digits:")
>if guess > number:
>print "Too high"
>elif guess < number:
>print "Too low"
>print "Just right"
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>
>
>
Hi Feziwe,
you might want to look at the random module to generate 'guess'
ramdon.randrange() more specifically.
Nick .
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[Tutor] Filtering Spreadsheet Data
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 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] passing variables between frames?
Hello, I am having trouble with passing variables between frames (Frame1 and Dialog1). I'm using wxpython to write an application. when I run my application the parent frame appears and within the parent frame I can assign values to variables. I then have a button that launches a child dialog. I want to access the values from the parent frame in the dialog. for example say I had a listbox in the parent frame and I choose the first entry 'a' from the list. I then launch the child dialog and I want to put the value of the selection from the list box into a text field - when I lauch the child dialog a text field appears with the value '0'. From within Frame1 I can use the getselection() function to get the listbox selection. although in the child dialog I tried to use Frame1.listBox.getselection() to get the selection from Frame1. this doesn't work. not sure what to do here? any ideas? thanks. Jeff___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Calendar Combo Box
Hey everyone Is there a built-in calendar combo box as in Visual Basic? Can anyone point me in the right direction? Thanks in advanced Alberto ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] passing variables between frames?
Jeff Peery wrote: > Hello, I am having trouble with passing variables between frames (Frame1 > and Dialog1). I'm using wxpython to write an application. when I run my > application the parent frame appears and within the parent frame I can > assign values to variables. I then have a button that launches a child > dialog. I want to access the values from the parent frame in the > dialog. for example say I had a listbox in the parent frame and I > choose the first entry 'a' from the list. I then launch the child > dialog and I want to put the value of the selection from the list box > into a text field - when I lauch the child dialog a text field appears > with the value '0'. From within Frame1 I can use the getselection() > function to get the listbox selection. although in the child dialog I > tried to use Frame1.listBox.getselection() to get the selection from > Frame1. this doesn't work. not sure what to do here? any ideas? thanks. It's hard to know specifically what is broken without seeing code or error messages. My guess is that the variable Frame1 is not in scope in the dialog box code. But I would suggest a different approach... - Make the dialog box code independent of the values of variables in Frame1. Generally for me this means packaging up the dialog box in a function or class that is passed the values it needs to use and returns some result to the user. A very simple example is a dialog box that presents an error message; you could make a function showError(msg) that doesn't know anything about its caller. - In the event handler for the button in Frame1, gather the values needed by the dialog, launch it, get the result and handle it. This style keeps your dialog code independent of the rest of the program. An immediate benefit is that you can write a simple test driver that exercises the dialog without having to create any infrastructure. (This is the way I create most dialog boxes. I run it standalone until I am happy with its appearance and function, then I integrate it into the rest of the app.) Another long-term benefit is the dialogs are reusable; you may not see a need for this but in the long run some of them will probably have more than one use. HTH, Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] better resolution on time.sleep()?
I'm running an application that has a polling loop to check a serial port for certain signals, and on my laptop I can get about 6700 samples per second, which (of course) consumes 100% CPU; which may impact battery life. BTW, I'm running Python 2.2.2 on my laptop... not had a need to upgrade yet. I really only need between 500 and 1000 samples per second, but as the smallest sleep available normally is time.sleep(.01) -- which brings my samples/sec to a nice 100; but I need it a little faster. I found this: http://freshmeat.net/projects/rtsched/ which is supposed to bring real-time scheduling to Python (which the docs say is dangerous if used incorrectly) and also implementations of msleep/usleep/nanosleep. I downloaded it, compiled it, installed it, and popped in an import rtsched at the top and rtsched.msleep(1) where the time.sleep(.01) used to go... and now I get around 50 samples per second. I tried the usleep(1) and nanosleep(1) and the same thing happens. The rtsched implementation *is* working, as I can put in rtsched.msleep(100) and my samples/sec drops to 10. I'm guessing there's so much overhead to calling rtsched that it's b0rking up the works. :-/ Anyone know of: 1) a working millisleep/microsleep implementation for python 2.2+? -or- 2) will upgrading to a newer version of Python get me what I need? [[ I looked thru the "New in 2.4" dox and nothing I needed was listed...]] I've googled (off and on for more than a few days) and searched the archives, and came up empty so far... This isn't life or death by any means... My laptop known for long battery life, so everything should be OK as is, but why grind the CPU if it's not necessary, eh? ;-) Just a niggling little thing that's been on the back of my mind... [[ Oh, I found a reference to wxwindows that might have something that could work, but I was hoping for a little less overkill... my app barely uses ncurses. ]] Thanks! Roger "Merch" Merchberger -- Roger "Merch" Merchberger -- SysAdmin, Iceberg Computers [EMAIL PROTECTED] Hi! I am a .signature virus. Copy me into your .signature to join in! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] better resolution on time.sleep()?
Quoting Roger Merchberger <[EMAIL PROTECTED]>: > I really only need between 500 and 1000 samples per second, but as the > smallest sleep available normally is time.sleep(.01) -- which brings my > samples/sec to a nice 100; but I need it a little faster. Where did you find that out? > 2) will upgrading to a newer version of Python get me what I need? > [[ I looked thru the "New in 2.4" dox and nothing I needed was > listed...]] I just did some experimenting ... I am running ActiveState Python 2.4.1 under Windows XP / cygwin. >>> def check(): ... now = time.clock() ... for i in xrange(1): ... time.sleep(0.001) ... print time.clock() - now ... >>> check() 11.2695306247 >>> def check(): ... now = time.clock() ... for i in xrange(10): ... time.sleep(0.0001) ... print time.clock() - now ... >>> check() 2.77601985727 >>> check() 8.70900742972 The first test is fairly consistent with time.sleep(0.001) doing what you expect. The second is a bit puzzling to me, though... -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Simple password generation
Hi. First post. I'm trying to (more or less) copy the functionality of quepasa (http://quepasa.sourceforge.net), a simple password generation script that builds passwords from a combination of a passphrase and another string (like a domain name). If you enter the same passphrase and string, you should get the same password (in case you forget...). I've added a bit so that if neither a passphrase nor a string is entered, the function returns a random (or somewhat random) eight- character string. Am i on the right track here? (I'm brand new to sha and so forth.) Criticisms? Thx! Trey --- import sha, re, base64, string from random import choice def QuePasa (salt='', passphrase='', length=8): salted = passphrase + salt newpasswd = '' if (salted): hash = sha.new(salted).digest() # for now, strip non-alphanumeric characters newpasswd = re.sub(r'\W', '', base64.encodestring(hash)) [:length] else: chars = string.letters + string.digits for i in range(length): newpasswd = newpasswd + choice(chars) return newpasswd if __name__ == "__main__": sites = ['thissite.com','thatsite.com', 'theothersite.com',''] passphrase = 'all your base are belong to us' for i in range(10): for site in sites: print "%s : %s" % (site, QuePasa(passphrase, site)) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] better resolution on time.sleep()?
Rumor has it that [EMAIL PROTECTED] may have mentioned these words: >Quoting Roger Merchberger <[EMAIL PROTECTED]>: > > > I really only need between 500 and 1000 samples per second, but as the > > smallest sleep available normally is time.sleep(.01) -- which brings my > > samples/sec to a nice 100; but I need it a little faster. > >Where did you find that out? Imperical testing -- I put in values smaller than .01, yet never got more than 100 samples per second. ;-) I then googled around and I saw a few other people found the same thing; but with no resolutions. I *can* post some ugly code if necessary... >I just did some experimenting ... I am running ActiveState Python 2.4.1 under >Windows XP / cygwin. I'm running under Linux From Scratch, book 4.0, kernel 2.4.29. [code snippage] >The first test is fairly consistent with time.sleep(0.001) doing what you >expect. The second is a bit puzzling to me, though... Yea, seems to be a bit of weirdness there... Hrm Anyway, maybe I'll go snag 2.4.x and see what that does for me... Laterz, Roger "Merch" Merchberger -- Roger "Merch" Merchberger | Anarchy doesn't scale well. -- Me [EMAIL PROTECTED] | SysAdmin, Iceberg Computers ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Filtering Spreadsheet Data
Luke Jordan wrote: > 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. pyExcelerator seems to work well for parsing Excel spreadsheets. (it basically gives you a dictionary for each worksheet) Google should find it for you. (you could also use COM ... but that's a bit more effort) -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] better resolution on time.sleep()?
Rumor has it that Roger Merchberger may have mentioned these words:
Yea, yea, I'm replying my own message you'll see why later! ;-)
>Rumor has it that [EMAIL PROTECTED] may have mentioned these words:
> >I just did some experimenting ... I am running ActiveState Python 2.4.1
> under
> >Windows XP / cygwin.
>
>I'm running under Linux From Scratch, book 4.0, kernel 2.4.29.
I downloaded and compiled Python 2.4.1 this evening, and the granularity of
sleep hasn't changed on my system... maybe it's a kernel limitation? Hrm...
Despite my pitiful C knowledge, I found a code snippet I modified to make a
command-line "msleep" command which sleeps for 1 millisecond & exits, and
called that with an os.system('msleep') call. The best I could get then is
around 32 samples for second, so that seemed "marginally less efficient"
calling my msleep command thru the OS compared to the "realtime usleep"
function I downloaded earlier to run on Python 2.2.2. The realtime package
wouldn't compile with Python 2.4.1 (not that it did me much good before... ;-).
=-=-=
I'm downloading the source to wxPython now, there is a wx.usleep function
in there. As I mentioned, it seems a bit'o'overkill to me, but what the
heck, in for a penny, in for a pound, eh? ;^>
I'll let y'all know how it turns out...
Laterz,
Roger "Merch" Merchberger
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[EMAIL PROTECTED] |
SysAdmin, Iceberg Computers
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Re: [Tutor] passing variables between frames?
> want to access the values from the parent frame in the dialog. > for example say I had a listbox in the parent frame and I choose > the first entry 'a' from the list. I then launch the child > dialog and I want to put the value of the selection from the > list box into a text field - when I lauch the child dialog > a text field appears with the value '0'. From within Frame1 > I can use the getselection() function to get the listbox > selection. although in the child dialog I tried to use > Frame1.listBox.getselection() to get the selection from Frame1. > this doesn't work. not sure what to do here? any ideas? thanks. The dialog should be subclassed and you can add a parameter to the constructor. When you create the dialog pass in Frame1 as the value of your new parameter. Within the constructor assign the parameter to an attribute of the object, self.parent say. Within the event handlers in the dialog you can now reference Frame1 as self.parent. HTH Alan G Author of the Learn to Program web tutor http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
