🌐 Mailman 3 July 2007 - Python-list - python.org

Re: Making Gridded Widgets Expandable
by Jim July 31, 2007

July 31, 2007

On Jul 30, 8:24 am, "Hamilton, William " <wham...(a)entergy.com> wrote: > > From: Jim > > Hi, > > I'm looking at page 548 of Programming Python (3rd Edition) by Mark > > Lutz. > > The following GUI script works with no problem, i.e., the rows and > > columns expand: > > ================================================================= > > # Gridded Widgets Expandable page 548 > > > from Tkinter import * > > colors = ["red", "white", "blue"] > > > def gridbox(root): > > Label(root, text = 'Grid').grid(columnspan = 2) > > r = 1 > > for c in colors: > > l = Label(root, text=c, relief=RIDGE, width=25) > > e = Entry(root, bg=c, relief=SUNKEN, width=50) > > l.grid(row=r, column=0, sticky=NSEW) > > e.grid(row=r, column=1, sticky=NSEW) > > root.rowconfigure(r, weight=1) > > r += 1 > > root.columnconfigure(0, weight=1) > > root.columnconfigure(1, weight=1) > > > root = Tk() > > gridbox(Toplevel(root)) > > Button(root, text="Quit", command=root.quit).grid() > > mainloop() > > ================================================================= > > However, the following GUI script using class does not expand rows and > > columns: > > ================================================================= > > # Gridded Widgets Expandable 2 > > > from Tkinter import * > > colors = ["red", "white", "blue"] > > > class GUI(Frame): > > def __init__(self,master): > > Frame.__init__(self,master) > > self.grid() > > self.gridbox() > > > def gridbox(self): > > Label(self, text = 'Grid').grid(columnspan = 2) > > r = 1 > > for c in colors: > > l = Label(self, text=c, relief=RIDGE, width=25) > > e = Entry(self, bg=c, relief=SUNKEN, width=50) > > l.grid(row=r, column=0, sticky=NSEW) > > e.grid(row=r, column=1, sticky=NSEW) > > self.rowconfigure(r, weight=1) > > r += 1 > > self.columnconfigure(0, weight=1) > > self.columnconfigure(1, weight=1) > > > root = Tk() > > root.title("Gridded Widgets Expandable") > > app = GUI(root) > > Button(root, text="Quit", command=root.quit).grid() > > root.mainloop() > > ================================================================= > > What am I missing? > > In the first, your gridbox has Toplevel(root) as its master, causing it > to be created in a new window. In the second, it has Frame(root) as its > master, which does not create a new window. Changing Frame to Toplevel > in the class statement and the call to __init__ causes them to act > identically. > > -- > -Bill Hamilton- Hide quoted text - > > - Show quoted text - Thank you Bill Hamilton.

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Re: making a variable available in a function from decorator
by Marc 'BlackJack' Rintsch July 30, 2007

July 30, 2007

On Sun, 29 Jul 2007 15:22:47 -0700, rkmr.em(a)gmail.com wrote: > I create a variable in a decorator. i want to be able to access that > variable in the function to be decorated. How to do this? Pass it as argument to the function: def deco(func): eggs = 42 def decorated(*args, **kwargs): kwargs['spam'] = eggs func(*args, **kwargs) return decorated @deco def test(parrot, spam): print parrot, spam Ciao, Marc 'BlackJack' Rintsch

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pythonic parsing of URL
by GreenH July 30, 2007

July 30, 2007

I get some string as below from a library method (qt3 QDropEvent.data()) I use. file:///C:/Documents%20and%20Settings/Username/My%20Documents/45-61-Abc%20fold-%20den.vru I need file path on my system, for the above example: C:/Documents and Settings/Username/My Documents/45-61-Abc fold- den.vru I am doing the below, it doesn't look pythonic, can someone suggest any elegant solution, which is not too cryptic to understand? yep, I do care about readability of the code to average python user :) -------------------- tmpTuple = urlparse.urlparse(fileURLname) tmpString = tmpTuple[2].strip('/\\') fileName = urllib.unquote(tmpString) #For some reason the string contained in 'fileName' has some unprintable trailing characters, Any ideas on that? #thus I do below fileName = fileName.split('.vru')[0] + '.vru' -------------------- Thanks, Greene.

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Python-URL! - weekly Python news and links (Jul 30)
by Gabriel Genellina July 30, 2007

July 30, 2007

QOTW: "If you really want to learn hard-core Python, probably your best bet is: * read everything Tim Peters has ever written in comp.lang.python (this will take a few months), start with "import this" * read everything the PyPy guys have ever written (particularly Christian and Armin) * read and try to beat the more exotic recipes in the Python cookbook * read the papers from the various PyCons on metaclasses and the like, build a couple of dozen metaclasses and descriptors." - Mike C. Fletcher "Why would you want to become a programmer? Programmers smell bad, they have no social life, they get treated like crap by everyone. They can get paid pretty well but then they spend all the money on useless electronic junk so they still live like bums. There is only one reason to be a programmer, which is that the drive to program burns in you like a fire. But in that case don't ask how to become a programmer, because you are already one, so welcome to the ranks ;-)." - Paul Rubin Moving from .net to Python: How to implement Events and Delegates (Observer pattern) http://groups.google.com/group/comp.lang.python/browse_thread/thread/c6808e… How to efficiently access the first, second, etc. lines of a text file http://groups.google.com/group/comp.lang.python/browse_thread/thread/800e92… Borrowing from the D language: 123 456 789 == 123456789, and other suggestions. http://groups.google.com/group/comp.lang.python/browse_thread/thread/93dc57… Ways to write an "is_iterable" function, and why there can't be an universal version: http://groups.google.com/group/comp.lang.python/browse_thread/thread/c37eea… Using ClientForm and mechanize to automate web form submissions http://groups.google.com/group/comp.lang.python/browse_thread/thread/d544e5… Started as: Where do they teach Python officially?, later discussing what's good for a programmer to know: http://groups.google.com/group/comp.lang.python/browse_thread/thread/fafd2b… math.pow(3,50)!=3**50 -or- Don't use floating point exponentiation when you actually want an integer operation http://groups.google.com/group/comp.lang.python/browse_thread/thread/b2155e… Closures/Blocks in Python: what is good Ruby code style is not necesarily good for Python. http://groups.google.com/group/comp.lang.python/browse_thread/thread/7e3ee9… How get "next month's" name: the orthodox ways, and a tricky one by Carsten Haese: http://groups.google.com/group/comp.lang.python/browse_thread/thread/1baa0d… ======================================================================== Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Mygale is a news-gathering webcrawler that specializes in (new) World-Wide Web articles related to Python. http://www.awaretek.com/nowak/mygale.html While cosmetically similar, Mygale and the Daily Python-URL are utterly different in their technologies and generally in their results. Just beginning with Python? This page is a great place to start: http://wiki.python.org/moin/BeginnersGuide/Programmers The Python Papers aims to publish "the efforts of Python enthusiats": http://pythonpapers.org/ The Python Magazine is a technical monthly devoted to Python: http://pythonmagazine.com Readers have recommended the "Planet" sites: http://planetpython.org http://planet.python.org comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/groups?oi=djq&as_ugroup=comp.lang.python.announce Python411 indexes "podcasts ... to help people learn Python ..." Updates appear more-than-weekly: http://www.awaretek.com/python/index.html Steve Bethard continues the marvelous tradition early borne by Andrew Kuchling, Michael Hudson, Brett Cannon, Tony Meyer, and Tim Lesher of intelligently summarizing action on the python-dev mailing list once every other week. http://www.python.org/dev/summary/ The Python Package Index catalogues packages. http://www.python.org/pypi/ The somewhat older Vaults of Parnassus ambitiously collects references to all sorts of Python resources. http://www.vex.net/~x/parnassus/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ Python Success Stories--from air-traffic control to on-line match-making--can inspire you or decision-makers to whom you're subject with a vision of what the language makes practical. http://www.pythonology.com/success The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for Python's development and maintenance. http://www.python.org/psf/ Among the ways you can support PSF is with a donation. http://www.python.org/psf/donate.html Kurt B. Kaiser publishes a weekly report on faults and patches. http://www.google.com/groups?as_usubject=weekly%20python%20patch Although unmaintained since 2002, the Cetus collection of Python hyperlinks retains a few gems. http://www.cetus-links.org/oo_python.html Python FAQTS http://python.faqts.com/ The Cookbook is a collaborative effort to capture useful and interesting recipes. http://aspn.activestate.com/ASPN/Cookbook/Python Many Python conferences around the world are in preparation. Watch this space for links to them. Among several Python-oriented RSS/RDF feeds available are http://www.python.org/channews.rdf http://bootleg-rss.g-blog.net/pythonware_com_daily.pcgi http://python.de/backend.php For more, see http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all The old Python "To-Do List" now lives principally in a SourceForge reincarnation. http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse http://www.python.org/dev/peps/pep-0042/ The online Python Journal is posted at pythonjournal.cognizor.com. editor(a)pythonjournal.com and editor(a)pythonjournal.cognizor.com welcome submission of material that helps people's understanding of Python use, and offer Web presentation of your work. del.icio.us presents an intriguing approach to reference commentary. It already aggregates quite a bit of Python intelligence. http://del.icio.us/tag/python *Py: the Journal of the Python Language* http://www.pyzine.com Archive probing tricks of the trade: http://groups.google.com/groups?oi=djq&as_ugroup=comp.lang.python&num=100 http://groups.google.com/groups?meta=site%3Dgroups%26group%3Dcomp.lang.pyth… Previous - (U)se the (R)esource, (L)uke! - messages are listed here: http://www.ddj.com/topic/python/ (requires subscription) http://groups-beta.google.com/groups?q=python-url+group:comp.lang.python*&s… http://purl.org/thecliff/python/url.html (dormant) or http://groups.google.com/groups?oi=djq&as_q=+Python-URL!&as_ugroup=comp.lan… There is *not* an RSS for "Python-URL!"--at least not yet. Arguments for and against are occasionally entertained. Suggestions/corrections for next week's posting are always welcome. E-mail to <Python-URL(a)phaseit.net> should get through. To receive a new issue of this posting in e-mail each Monday morning (approximately), ask <claird(a)phaseit.net> to subscribe. Mention "Python-URL!". Write to the same address to unsubscribe. -- The Python-URL! Team-- Phaseit, Inc. (http://phaseit.net) is pleased to participate in and sponsor the "Python-URL!" project. Watch this space for upcoming news about posting archives.

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Re: making a variable available in a function from decorator
by Bruno Desthuilliers July 30, 2007

July 30, 2007

rkmr.em(a)gmail.com a écrit : (top-post corrected) > > On 30 Jul 2007 06:17:25 GMT, Marc 'BlackJack' Rintsch <bj_666(a)gmx.net> wrote: >> On Sun, 29 Jul 2007 15:22:47 -0700, rkmr.em(a)gmail.com wrote: >> >>> I create a variable in a decorator. i want to be able to access that >>> variable in the function to be decorated. How to do this? > >> Pass it as argument to the function: >> >> def deco(func): >> eggs = 42 >> def decorated(*args, **kwargs): >> kwargs['spam'] = eggs >> func(*args, **kwargs) >> return decorated >> >> @deco >> def test(parrot, spam): >> print parrot, spam > is it possible to do this without passing it as a function argument? What's your use case, exactly ? Having a function depending on a name being set by a decorator is not exactly pythonic, and arguments are meant to pass variables to functions...

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Re: How to write GUI and event separately in wxPython??
by Marc 'BlackJack' Rintsch July 30, 2007

July 30, 2007

On Mon, 30 Jul 2007 06:32:55 -0400, Steve Holden wrote: > >>> [x for x in xrange(0, 101)] == [y for y in xrange(101)] > True First I thought: Why the unnecessary list comprehension but to my surprise: In [33]: xrange(42) == xrange(42) Out[33]: False That's strange. Ciao, Marc 'BlackJack' Rintsch

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Re: Events: The Python Way
by Gianmaria July 30, 2007

July 30, 2007

"David Wilson" <dw(a)botanicus.net> ha scritto nel messaggio news:mailman.1295.1185665717.22759.python-list@python.org... > Hi there, > > Python has no built-in way of doing this. You may consider writing > your own class if you like this pattern (I personally do): > > class Event(object): > def __init__(self): > self.subscribers = set() > > def __iadd__(self, subscriber): > self.subscribers.add(subscriber) > return self > > def __isub__(self, subscriber): > self.subscribers.pop(subscriber) > return self > > def __call__(self, *args, **kwargs): > for subscriber in self.subscribers: > subscriber(*args, **kwargs) > > > def HandleFoo(strng): > print "HandleFoo:", strng > > OnFoo = Event() > OnFoo += HandleFoo > > OnFoo("Test.") > > > On 29/07/07, Gianmaria <gianmaria(a)hotmail.com> wrote: >> Hi, >> i'm a .net programmer and i'm learnig python, so this question can be >> very >> stupid or easy for python programmers. I've a doubt about events.... here >> is >> what: >> >> in c# for example i can write a delegate and an event in this way... >> >> public delegate SomethingChangedHandler(string message); >> public event SomethingChangedHandler SomethingChanged; >> >> and later in the code fire this event in this way... >> >> if(SomethingChanged != null) >> { >> SomethingChanged("Nothing important"); >> } >> >> and the subscription of this event of other objects can be easy as >> >> eventGeneratorObject.SomethingChanged += new >> SomethingChangedHandler(aFunctionto_takecareof_it); >> >> and even the handlig of the event is aesy... >> >> void aFunctionto_takecareof_it(string msg) >> { >> >> } >> >> >> ....now the question is.. how can i do the same using Python? Every help >> is >> appreciated >> >> >> >> >> >> Regards, >> Gianmaria >> >> -- >> http://mail.python.org/mailman/listinfo/python-list >> Txs so much. Gianmaria

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Cross platform Python app deployment
by Will McGugan July 30, 2007

July 30, 2007

Hi, Is there some reference regarding how to package a Python application for the various platforms? I'm familiar with Windows deployment - I use Py2Exe & InnoSetup - but I would like more information on deploying on Mac and Linux. TIA, Will McGugan -- http://www.willmcgugan.com

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Detecting __future__ features
by Steven D'Aprano July 30, 2007

July 30, 2007

How would one tell at runtime if a particular feature has been enabled by the "from __future__ import thing" statement? For example, I can do this: if 1/2 == 0: print "classic division in use" else: print "true division in use" I could even do this: from keyword import keyword if keyword("with"): print "with statement enabled" else: print "with statement not enabled" (I don't especially care whether the feature in question has been enabled via an explicit call to import, or because it has become the default.) Is there any general mechanism? -- Steven.

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Making Gridded Widgets Expandable
by Jim July 30, 2007

July 30, 2007

Hi, I'm looking at page 548 of Programming Python (3rd Edition) by Mark Lutz. The following GUI script works with no problem, i.e., the rows and columns expand: ================================================================= # Gridded Widgets Expandable page 548 from Tkinter import * colors = ["red", "white", "blue"] def gridbox(root): Label(root, text = 'Grid').grid(columnspan = 2) r = 1 for c in colors: l = Label(root, text=c, relief=RIDGE, width=25) e = Entry(root, bg=c, relief=SUNKEN, width=50) l.grid(row=r, column=0, sticky=NSEW) e.grid(row=r, column=1, sticky=NSEW) root.rowconfigure(r, weight=1) r += 1 root.columnconfigure(0, weight=1) root.columnconfigure(1, weight=1) root = Tk() gridbox(Toplevel(root)) Button(root, text="Quit", command=root.quit).grid() mainloop() ================================================================= However, the following GUI script using class does not expand rows and columns: ================================================================= # Gridded Widgets Expandable 2 from Tkinter import * colors = ["red", "white", "blue"] class GUI(Frame): def __init__(self,master): Frame.__init__(self,master) self.grid() self.gridbox() def gridbox(self): Label(self, text = 'Grid').grid(columnspan = 2) r = 1 for c in colors: l = Label(self, text=c, relief=RIDGE, width=25) e = Entry(self, bg=c, relief=SUNKEN, width=50) l.grid(row=r, column=0, sticky=NSEW) e.grid(row=r, column=1, sticky=NSEW) self.rowconfigure(r, weight=1) r += 1 self.columnconfigure(0, weight=1) self.columnconfigure(1, weight=1) root = Tk() root.title("Gridded Widgets Expandable") app = GUI(root) Button(root, text="Quit", command=root.quit).grid() root.mainloop() ================================================================= What am I missing? Thanks, Jim

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