🌐 Mailman 3 October 2004 - Python-list - python.org

Python and MySQL 4.1
by webdsine Oct. 31, 2004

Oct. 31, 2004

Hello. I just upgrade to MySQL 4.1 from 4.0, and I'm having trouble retrieving text from the DB in the proper format using the MySQLdb module in Python. All text fields that are retrieved are in this format: array('c', 'Whatever is in the field') The only data that's not displayed in that format are enum values, and when I was still in v4.0 only 'Whatever is in the field' is retrieved. Are there any quick fixes? I've completed my Python application already, so I don't really want to go in and mess with the source code if I don't need to. Thanks in advance.

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int/long unification hides bugs
by kartick_vaddadi＠yahoo.com Oct. 31, 2004

Oct. 31, 2004

there seems to be a serious problem with allowing numbers to grow in a nearly unbounded manner, as int/long unification does: it hides bugs. most of the time, i expect my numbers to be small. 2**31 is good enough for most uses of variables, and when more is needed, 2**63 should do most of the time. granted, unification allows code to work for larger numbers than foreseen (as PEP 237 states) but i feel the potential for more undetected bugs outweighs this benefit. the other benefit of the unification - portability - can be achieved by defining int32 & int64 types (or by defining all integers to be 32-bit (or 64-bit)) PEP 237 says, "It will give new Python programmers [...] one less thing to learn [...]". i feel this is not so important as the quality of code a programmer writes once he does learn the language. -kartik

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Re: Plugin system
by Greg Copeland Oct. 31, 2004

Oct. 31, 2004

On Sat, 30 Oct 2004 07:58:27 -0700, Josiah Carlson wrote: > > Reinhold Birkenfeld <reinhold-birkenfeld-nospam(a)wolke7.net> wrote: >> >> Irmen de Jong wrote: >> > Reinhold Birkenfeld wrote: >> > >> >> How would you implement a plugin system (for a web-based application)? >> > >> > This is so general a question that I cannot think of anything concrete to answer. >> > Please ask again, with more detail about what you want/need/have in mind. >> >> Okay, the question is too open: My focus is on how you would structure >> the plugin code (directories, files) and how you would write code to >> load these plugins. > > ...Have a place for plugins > app/plugins > > ...Load the plugins on startup > import traceback > import os > for fn in os.listdir('plugins'): > if fn[:1] != '_' and fn.split('.')[-1] in ('py', 'pyw'): > try: > globals()[fn] = \ > __import__('plugins.%s'%fn, globals(), locals(), [fn]) > except: > traceback.print_exc() > > Etcetera. May not be the best, but it will get the job done. > > - Josiah Just FYI, dynamically loaded plugins will not be caught by tools like py2exe. Another mechanism, which may be more py2exe friendly, is to make a tool which dynamically creates a python file, which lists all of the imports. That way, you import the dynamically created file, but once it's created, you immediately leverage the file for use with py2exe, which can now follow all of the imports. Of course, if you never plan on being a py2exe user, you can happily ignore my ramblings. ;) Cheers, Greg

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meta-sig alive?
by Greg Copeland Oct. 31, 2004

Oct. 31, 2004

Is the python meta-sig still alive? I noticed that the archives are not current. I also recently posted it to and never got a reply. Who do I need to contact to create a SIG? Thanks, Greg

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diacanvas.view error
by Gianluca Sartori Oct. 30, 2004

Oct. 30, 2004

Hi guys, >>> import diacanvas Fatal Python error: can't initialise module diacanvas.view Abortito I'm running Debian 3.0 + python2.3 + python2.3-diacanvas2. This problem appeared after installing/removing "dia". Any idea? Cheers, Gianluca

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Re: Win32+Zope+Python+Databases: What are my options?
by Mark Oct. 30, 2004

Oct. 30, 2004

Hi, I caught this thread a little late. You might want to consider looking at the mxODBC DA for Zope. ZopeMag, the sister publication of Py has published a freely available review of this (commercial) DA. Here is the link. http://www.zopemag.com/Issue008/Section_Products/product_mxODBC.html Cheers, Mark

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Re: [OT] Re: "number-in-base" ``oneliner''
by Jeremy Bowers Oct. 30, 2004

Oct. 30, 2004

On Sat, 30 Oct 2004 16:06:04 -0400, Brian van den Broek wrote: > I take it you didn't mean 0 was the only number, but rather the only > primitive number. (Alternatively " '0' is the only individual constant" > in the cant I prefer.) *shrug* Can't say I get worked up over the difference there. Regardless, you "can't" write "3". (Of course you can define it, but that's true of everything.) > I am also surprised to see "increment" -- I come to that material with > working in Philosophy of Mathematics and Logic, but almost every > presentation I have ever seen uses "successor". (I'm going off of > philosophical and mathematical logic presentations.) Yeah, that would be right. Couldn't recall the exact name. >> number theory, from which we build the rest of math. (Most people never >> dig this deep; it was one of my favorite classes in Comp. Sci., though, >> and we're probably the only people other than mathematicians to offer the >> course.) > > I've never taken a single comp. sci. course, so I will both claim and > commit disciplinary bias: serious undergrad logic/foundations of maths > courses do happen in Philosophy, too :-) Gonna nit pick myself here: "Most people". I think adding Philosophers and dilettantes and the rare electrical engineer isn't likely to change the "most". > On the other hand, I'm a bit surprised that these things get taught in > comp. sci. This past summer when teaching Intro to Logic, I encountered > at least one fourth-year comp. sci. student who had no idea what an > axiomatic system was :-| Graduate level. And many of the grads hated it. There is a chasm between the average Comp. Sci. student and the average professor; it isn't so bad at the grad level but it is still there. I'm not sure if it's worse than most disciplines, but I am inclined to believe it is, since Comp Sci typically can't really work out if it is math or engineering (wide consensus is that while there are scientific aspects to it, it probably shouldn't have it in the name), and there are, in my experience, fairly clean divisions of each student and professor into one camp or another. I was one of the exceedingly rare students who could do both quite well, and freely translate between them.

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Enumerate question: Inner looping like in Perl
by Pekka Niiranen Oct. 30, 2004

Oct. 30, 2004

Hi, I have Perl code looping thru lines in the file: line: while (<INFILE>) { ... $_ = do something ... if (/#START/) { # Start inner loop while (<INFILE>) { if (/#END/) { next line; } } } if (/#BLAH1/) { $_ = do something } if (/#BLAH2/) { $_ = do something } } I decided to use enumerate() in my Python version since current line must be modified (the $_ = idiom in Perl) ---code starts--- fh = codecs.open(f_path, "rU", "utf-8") contents = fh.readlines() fh.close() # Precompile regular expressions (speed hack?) findSTART = r'#START' matcherSTART = re.compile(findSTART, re.UNICODE) findEND = r'#END' matcherEND = re.compile(findEND, re.UNICODE) for i, row in enumerate(contents): row[i] = something if matcherSTART.search(row): "Oops! how to advance 'i' and 'row' untill: if matcherEND.search(row): continue ---code ends--- I could create extra parameter to store the state of the loop like: foundSTART = False for i, row in enumerate(contents): if foundSTART: if not matcherEND.search(row): continue else: foundSTART = False else: if matcherSTART.search(row): foundSTART = True if foundBLAH1: row[i] = something if foundBLAH2: row[i] = something but is this it really more maintainable code? Is there enumerate() hack that I am missing or should I go back to idiom?: for i in range(len(contents)): if matcherSTART.search(row[i]): while not matcherEND.search(row[i]): i = i + 1 continue -pekka-

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ctypes vs. swig
by Nelson Minar Oct. 30, 2004

Oct. 30, 2004

ctypes looks very powerful, and the convenience of doing everything at runtime seems significant. To what extent is it a replacement for swig for calling C code? I haven't really used ctypes, so I'm asking. Are there jobs that swig is better at and jobs that ctypes is better at? ctypes requires your code be in a dynamic library, and that ctypes is for C only. But those don't seem like major drawbacks for my uses. I did a bit of research on this question and all I found was this: http://sourceforge.net/mailarchive/message.php?msg_id=6887157 I have been thinking about instead of swig using ctypes and some form of automated header parser to make a new pyopengl

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Re: py2exe and window with info about error
by Krzysztof Książek Oct. 30, 2004

Oct. 30, 2004

On 2004-10-30 17:15:55 Josiah Carlson wrote: > How is your script being run? Is it placed in one of the registry > locations: > HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Run It is located in that registry key. Greetings, Krzysztof Ksiazek

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