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

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Re: Comparing Dictionaries
by Paddy July 30, 2007

July 30, 2007

Hi Kenneth, being new to Python i wondered if you at least considered Doctests as part of your testing solution. Other languages don't have Doctest. - Paddy.

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Fwd: Re: Comparing Dictionaries
by Kenneth Love July 30, 2007

July 30, 2007

>From: "Steven D'Aprano" <steve(a)REMOVE.THIS.cybersource.com.au> >Newsgroups: comp.lang.python >Subject: Re: Comparing Dictionaries >Date: Sat, 28 Jul 2007 10:21:14 +1000 >To: python-list(a)python.org > >On Fri, 27 Jul 2007 14:11:02 -0500, Kenneth Love wrote: > > > The published recipe (based on ConfigParser) did not handle my INI > > files. I have periods in both the section names and the key names. > > The INI files contents were developed according to an internally > > defined process that other non-Python programs rely on. The published > > recipe *did not work* with this scenario. > >I think you have made a mistake. ConfigParser as published certainly DOES >accept periods in section and option names. It just *works*. The recipe I'm using is based upon ConfigParser and creates a dictionary that is based on the contents of the INI file. The dictionary's key is based on the section name and the key name from the INI file. The two are concatenated with a separator. In the original recipe, the separator is a period. To use your example (deleted as an attempt at brevity), the dictionary would be: { "SECTION.FRED.option.wilma" : "45" } As originally written, the section name is now "SECTION" when you write the INI file back out. The key is "FRED.option.wilma". Here is the original recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65334 My version replaces the period with a dollar sign giving: { "SECTION.FRED$option.wilma" : "45" } I also removed the "import string" and put both the load() and save() functions in a file with proper comments and the Python equivalent of Javadoc comments. >Even if the existing ConfigParser doesn't do what you want, the right way >to fix the problem is not to recreate the entire module from scratch, but >to subclass it: >[snip] In no way did I rewrite ConfigParser. I have a real job with time pressures and I'm not so arrogant as to think I could whip something up in an hour that would be anywhere close to correct. I see that I wasn't as clear as I thought I was in my original post as you are second person to think I was developing my own INI solution. All I wanted to know was "How do I compare two dictionaries to see if they are equal?". It turns out that this functionality is built-in and it is my own stupid fault that my unit test was failing (modifying working code and writing a unit test at the same time is a recipe for failure). Oh well. Next time I'll spend two hours trying to figure it out instead of one before I post. :-\ >-- >Steven. > >-- >http://mail.python.org/mailman/listinfo/python-list -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Kenneth Love | Oklahoma Tax Commission DP Programmer/Analyst | Information Technology (405) 522 - 5864 | http://www.tax.ok.gov/ -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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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 11:16:01 -0400, Steve Holden wrote: > Marc 'BlackJack' Rintsch wrote: >> First I thought: Why the unnecessary list comprehension but to my surprise: >> >> In [33]: xrange(42) == xrange(42) >> Out[33]: False >> >> That's strange. >> > Not so strange really. The two xrange objects are different (though I > confess I haven't looked to see how they implement comparisons), but > iterating over them produces the same result. They are different objects, so are range(23) and another range(23) but those compare equal. Somehow I expected two seemingly equal `xrange` objects compare equal too. Ciao, Marc 'BlackJack' Rintsch

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Re: problems with logging module
by Alia Khouri July 30, 2007

July 30, 2007

On Jul 30, 8:01 am, "Gabriel Genellina" <gagsl-...(a)yahoo.com.ar> wrote: > To see what's going on, try using this old-fashioned debug technique: a > few print statements. My bad, problem was solved, the shortcoming was one of my variables pointing to nothingness (-; But I'm not letting the logging module off, it's still not the easiest or most intuitive module to work with. For example: a basic Log class that can be programatically configured would be quicker to work with then messing around with three different classes types if you want to get beyond basicConfig functionality: (Logger, handlers, formatters) To be able to do this would be nice: from logging import Log class MyClass: def __init__(self, x): self.x = x self.log = Log( level=logging.DEBUG, format="%(asctime)s %(levelname)s: %(message)s", datefmt = '%H:%M:%S', filename='app.log', filemode='a' ) Thanks for your help and time. AK

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Re: Database objects? Persistence? Sql Server woes
by Diez B. Roggisch July 30, 2007

July 30, 2007

Mike Howarth schrieb: > I've been having a few problems with connecting to SQL Server, initially I > was using dblib however found some problems with returning text fields > whereby all text fields were ignored and it bawked at multiline sql > statements. > > Having found these major stumbling blocks I've started using pymssql which > seems less flaky. One problem I've stumbled across is that I seem to reach > my max connections on the database fairly easily (given how my script was > written) and therefore have used the singleton pattern on my database > object. > > Great problem solved, or so I thought. > > Using the following code I'm finding that the Set is now also being enforced > as a singleton as well. > > class Set(Database,Product): > > def __init__(self, *args, **kw): > > Database.__init__(self) > Product.__init__(self) > > def dosomething(self): > cu = self.c.cursor() > > Having sat back and thought about it, its easy to understand why this is > occurring given I'm indicating that Set belongs to Database and therefore > this is a singleton as well. > > Being relatively new to Python I'm unsure on how to then go about using a > database object between each class. Can anyone advise me on how they > approach this, and whether there is a common approach to this? You might consider using a ORM mapper, like SQLObject or SQLAlchemy. If they support your backend, that is. Apart from that, this might help: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/302088 Store a connection per thread. Diez

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Bug? exec converts '\n' to newline in docstrings!?
by Edward K Ream July 30, 2007

July 30, 2007

It looks like both exec and execfile are converting "\n" to an actual newline in docstrings! Start idle: Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)] on win32 [rest of signon deleted] >>> s = '''\ strings = 'abc'.split("\n") ''' >>> print s strings = 'abc'.split(" ") I see this in my own calls to exec and execfile. Is this a bug or am I missing something? Edward ------------------------------------------------------------------- Edward K. Ream email: edreamleo(a)yahoo.com Leo: http://webpages.charter.net/edreamleo/front.html --------------------------------------------------------------------

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RE: Free support for Python developers
by Carroll, Barry July 30, 2007

July 30, 2007

Viktor: This is a great idea. Thank you I don't currently have a voice setup on my machine, but will try to get one as soon as possible. I would be pleased to trade English practice for Python support. Regards, Barry barry.carroll(a)datalogic.com 541-302-1107 ________________________ We who cut mere stones must always be envisioning cathedrals. -Quarry worker's creed > -----Original Message----- > From: Ferenczi Viktor [mailto:python@cx.hu] > Sent: Sunday, July 29, 2007 5:29 PM > To: python-announce-list(a)python.org > Subject: Free support for Python developers > > I am pleased to announce the availability of python support for English > speaking developers. The service is free of charge. More information: > > http://python.cx.hu/support/

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Database objects? Persistence? Sql Server woes
by Mike Howarth July 30, 2007

July 30, 2007

I've been having a few problems with connecting to SQL Server, initially I was using dblib however found some problems with returning text fields whereby all text fields were ignored and it bawked at multiline sql statements. Having found these major stumbling blocks I've started using pymssql which seems less flaky. One problem I've stumbled across is that I seem to reach my max connections on the database fairly easily (given how my script was written) and therefore have used the singleton pattern on my database object. Great problem solved, or so I thought. Using the following code I'm finding that the Set is now also being enforced as a singleton as well. class Set(Database,Product): def __init__(self, *args, **kw): Database.__init__(self) Product.__init__(self) def dosomething(self): cu = self.c.cursor() Having sat back and thought about it, its easy to understand why this is occurring given I'm indicating that Set belongs to Database and therefore this is a singleton as well. Being relatively new to Python I'm unsure on how to then go about using a database object between each class. Can anyone advise me on how they approach this, and whether there is a common approach to this? -- View this message in context: http://www.nabble.com/Database-objects--Persistence--Sql-Server-woes-tf4171… Sent from the Python - python-list mailing list archive at Nabble.com.

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Replacing overloaded functions with closures.
by king kikapu July 30, 2007

July 30, 2007

Hi, i am trying, to no avail yet, to take a C#'s overloaded functions skeleton and rewrite it in Python by using closures. I read somewhere on the net (http://dirtsimple.org/2004/12/python-is- not-java.html) that in Python we can reduce code duplication for overloaded functions by using closures. I do not quite understand this. Let's say we have the following simple C# code: int func(int i) { return i * 2; } string func(string s) { return s + s; } bool func(bool f) { return !f; } I wasn't able to find a way to express this thing in closures. I even tried to have the parameters i, s and f as parameters with default arguments with None value in the inner function and there to check for the None and do the needed work but i am not sure if this is the correct solution. Any help ? thanks in advance.

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