🌐 Mailman 3 March 2005 - Python-list - python.org

Need help
by brian March 1, 2005

March 1, 2005

I am working with a 3rd party credit card company that is using Python version 2.2.2. They are using the httplib module to post data to my server which is a dedicated server with no firewall or any rate-limiting or DDoS prevention. Every time they try, the first 2 posts are successful and it always throws this error on the third attempt. It is reproducable every time they run the program.

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Importing from upper packages
by Henning Kage March 1, 2005

March 1, 2005

I have a library with the following structure: library /app /db /gui /interface.py /wx /class.py Each __init__.py file imports the next sub-package. E.g.: library/__init__.py: import app, db, gui library/gui/__init__.py: import wx from interface import * library/gui/wx/__init__.py: from class import * >From the lowest layer "wx" I need to import an interface defined in the gui package. Therefore I tried the following in library/gui/wx/class.py: import library class ClassTest( libor.gui.Interface): pass I also set the PYTHONPATH to top directory, but I still get an ImportError. How could this problem be solved or otherwise, how should I import from upper packages in general? Thanks!

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Re: reuse validation logic with descriptors
by Steven Bethard March 1, 2005

March 1, 2005

David S. wrote: > I am looking for a way to implement the same simple validation on many > instance attributes and I thought descriptors > (http://users.rcn.com/python/download/Descriptor.htm) looked like the > right tool. > > But I am confused by their behavior on instance of my class. > I can only get the approximate behavior by using class variables. > > I am looking for something like: > > class SingleChar(object): > def init(self): > self._char = None > > def __set__(self, instance, value): > if not len(value) == 1: > raise ValueError > self._char = value > > def __get__(self, instance, owner): > return self._char > > class Flags(object): > def __init__(self): > self.a = SingleChar() > self.b = SingleChar() > > f = Flags() > f.a = "a" > f.b = "bb" > exceptions.ValueError > ValueError: > > What I actually get when I try this is f.a and f.b become str instances. > > Meanwhile, I can get this to work, except that a and b are now just class > attributes. > > class CFlags(object): > a = SingleChar() > b = SingleChar() > > What is the proper and clean way to accomplish this sort of thing, so that you > can reuse the logic in for many instance attributes across multiple classes? Looks like you're trying to reinvent the property descriptor. Try using the builtin property instead: py> def getchar(self): ... if not hasattr(self, '_char'): ... self._char = None ... return self._char ... py> def setchar(self, value): ... if not len(value) == 1: ... raise ValueError ... self._char = value ... py> singlechar = property(getchar, setchar) py> class Flags(object): ... a = singlechar ... b = singlechar ... py> f = Flags() py> f.a = "a" py> f.b = "bb" Traceback (most recent call last): File "<interactive input>", line 1, in ? File "<interactive input>", line 3, in setchar ValueError STeVe

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Why does interpreter flub
by syed_saqib_ali＠yahoo.com March 1, 2005

March 1, 2005

I have a file named testPython.py as shown below. I have shown a trace of the Interpreter Session in which I import the modules from this file using the command: "from testPython import *" When I do this, and modify a global variable from within a function, it seems that the interpreter is unaware of the updated value! See Trace #1 to see what I'm talking about. I don't understand why. Could somebody please supply a coherent explanation?? However, when I use the "import testPython" command instead, it seems to work as I would expect. (See Trace #2). Why the difference?? ==================START OF FILE================== #!C:\python21\python.exe -u -d x = 10 def main(): global x print "In Main" x = 12 def printX(): print x if __name__ == "__main__": main() ================== END OF FILE ================== ==================START OF TRACE 1================== Python 2.1 (#15, Apr 16 2001, 18:25:49) [MSC 32 bit (Intel)] on win32 Type "copyright", "credits" or "license" for more information. >>> from testPython import * >>> x 10 >>> main() In Main >>> printX() 12 >>> x 10 >>> ================== END OF TRACE 1 ================== ==================START OF TRACE 2================== Python 2.1 (#15, Apr 16 2001, 18:25:49) [MSC 32 bit (Intel)] on win32 Type "copyright", "credits" or "license" for more information. >>> import testPython >>> testPython.x 10 >>> testPython.main() In Main >>> testPython.printX() 12 >>> testPython.x 12 >>> ================== END OF TRACE 2 ==================

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urllib2.URLError: <urlopen error (7, 'getaddrinfo failed')> when trying to connect through a proxy
by Matt March 1, 2005

March 1, 2005

I'm trying to get the HTML data off of a webpage. Let's say for the sake of argument it's the python homepage. I've googled around and found some examples that people said worked. Here's what I've cobbled together: #getHTML.py ############################################ import urllib import urllib2 proxy_info = {'user':'us3r', 'password':'p@ssword', 'host':'MY_PROXY', 'port':'80'} os.environ['HTTP_PROXY'] = 'http://%(user)s:%(password)s@%(host)s:%(port)s' % proxy_info test_url = "http://www.python.org/index.html" handle = urllib2.urlopen(test_url) #handle = urllib.urlopen(test_url) txt = handle.read().lower() handle.close() print "Text: " print txt ################################# #end getHTML.py When I run this with urllib2 I get (with or without a dummy password): Traceback (most recent call last): File "P:\My Documents\Projects\Python\validate_zipcodes.py", line 103, in ? handle = urllib2.urlopen(test_url) File "C:\Python23\lib\urllib2.py", line 129, in urlopen return _opener.open(url, data) File "C:\Python23\lib\urllib2.py", line 326, in open '_open', req) File "C:\Python23\lib\urllib2.py", line 306, in _call_chain result = func(*args) File "C:\Python23\lib\urllib2.py", line 901, in http_open return self.do_open(httplib.HTTP, req) File "C:\Python23\lib\urllib2.py", line 886, in do_open raise URLError(err) urllib2.URLError: <urlopen error (7, 'getaddrinfo failed')> When I run it with urllib.urlopen, I get: Traceback (most recent call last): File "P:\My Documents\Projects\Python\validate_zipcodes.py", line 104, in ? handle = urllib.urlopen(test_url) File "C:\Python23\lib\urllib.py", line 76, in urlopen return opener.open(url) File "C:\Python23\lib\urllib.py", line 181, in open return getattr(self, name)(url) File "C:\Python23\lib\urllib.py", line 287, in open_http h = httplib.HTTP(host) File "C:\Python23\lib\httplib.py", line 1009, in __init__ self._setup(self._connection_class(host, port, strict)) File "C:\Python23\lib\httplib.py", line 507, in __init__ self._set_hostport(host, port) File "C:\Python23\lib\httplib.py", line 518, in _set_hostport raise InvalidURL("nonnumeric port: '%s'" % host[i+1:]) httplib.InvalidURL: nonnumeric port: 'p@ssword@MY_PROXY:80' Obviously, going through Internet Explorer works. Has anyone else had a similar issue? I don't know the proxy situation we have here, so is it possible that the proxy is causing this? Any help is much appreciated. Thanks for at least reading this far! M@

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Re: yield_all needed in Python
by Steven Bethard March 1, 2005

March 1, 2005

Mike C. Fletcher wrote: > ... it nicely encapsulates the learning of "generators" so that > when you see yield up front you know something generatish is going on. +1 for "generatish" as VOTW (Vocabulation of the Week). =) STeVe

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Module RE, Have a couple questions
by dasacc＠gmail.com March 1, 2005

March 1, 2005

(1) How do I perform a search for "word" and have it return every line that this instance is found? (2) How do I perform a search for "word" and "wordtwo" at the same time to return every line these instances are found so that the order in which these lines are in are left intact. If there's another standard module more suited for this let me know, and no I dont want to use sed :) Thanks

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Re: yield_all needed in Python
by Jeremy Bowers March 1, 2005

March 1, 2005

On Tue, 01 Mar 2005 12:42:51 -0600, Skip Montanaro wrote: > yield <expr> yield *<expr> (Mu-hu-ha-ha-ha!)

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Vancouver Python User Group Reminder
by Paul Prescod March 1, 2005

March 1, 2005

Tuesday March 1st is the first Tuesday of the month and the Vancouver Python, Zope and Plone user's group will have its monthly meeting at ActiveState (580 Granville) at 7:00. The topic is GNU Radio and Python. GNU Radio is a free software implementation of Software Defined Radio. "Imagine if the only thing stopping your handheld PDA from simultaneously being a GPS receiver, phone, radio or miniature TV was your willingness to download and install some free software program." "We're pretty much turning all hardware problems into software problems," Blossom says. "We want to facilitate evolution in the radio arena." "A software radio is a radio whose channel modulation waveforms are defined in software. That is, waveforms are generated as sampled digital signals, converted from digital to analog via a wideband DAC and then possibly upconverted from IF to RF. The receiver, similarly, employs a wideband Analog to Digital Converter (ADC) that captures all of the channels of the software radio node. The receiver then extracts, downconverts and demodulates the channel waveform using software on a general purpose processor." GNU Radio is a hybrid C++ / Python system. The primitive signal processing blocks are implemented in C++. All graph construction, policy decisions and non-performance critical operations are performed in Python. All of the underlying runtime system is manipulatable from Python. Upcoming talks: April 5, 2005 Large Scale Python

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wxPython/IEHtmlWindow documentation (what events are available ?)
by richardshea＠despammed.com March 1, 2005

March 1, 2005

Hi - I've got a script which is making use of ... import wx.lib.iewin as iewin ... and so ... self.ie = iewin.IEHtmlWindow(self, -1, style = wx.NO_FULL_REPAINT_ON_RESIZE) ... but I can't find any documentation about what a IEHtmlWindow object might do - in particular what I might do with the events. I have some sample code and I've taken a look at iewin.py but what I would like to know is when the various events are going to fire ? 'DOCUMENTCOMPLETE' seems fairly self-explanatory but others such as 'BEFORENAVIGATE2' and 'STATUSTEXTCHANGE' are less guessable. I've looked at (what I think is) the MS documentation but I cannot find references to any of these events - can anyone point me information please ? Thanks Richard.

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