Mailman 3 July 2005 - Python-Dev

Re: [Python-Dev] reducing self.x=x; self.y=y; self.z=z boilerplate code
by Ralf W. Grosse-Kunstleve July 1, 2005

July 1, 2005

I am happy to see that others agree we need something better than self.x=x; self.y=y; self.z=z. Phillip J. Eby wrote: > class grouping: > def __init__(self, x, y, z): > initialize(self, locals()) Been there (older code): http://phenix-online.org/cctbx_sources/scitbx/scitbx/python_utils/misc.py I don't like it because - I do have to remember how to import adopt_init_args/initialize. - I also have to remember the locals() part (unpythonic boilerplate again). - I get both self.x and x. This lead to subtle bugs a few times when I accidentally assigned to x instead of self.x or vice versa in the wrong place). - It is sure to be less efficient than the .x support I propose. I'd be happy if - adopt_init_args/initialize became a (efficiently implemented) Python built-in. - and the locals() part is not needed. However, IMO the .x solution is still far better because I often want to do something like this: class grouping: def __init__(self, .keep_this, .and_this, but_not_this, .but_this_again): pass With the adopt_init_args/initialize solution you'd have to write: class grouping: def __init__(self, keep_this, and_this, but_not_this, but_this_again): initialize(self, locals(), exclude=["but_not_this"]) Unpythonic boilerplate again (the but_not_this duplication). Cheers, Ralf

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Decimal rounding doc
by Facundo Batista July 1, 2005

July 1, 2005

I'm preparing the pre-PEP of a Money module, and I don't want to explain the rounding methods there again. So my idea was to point to Decimal documentation regarding them. And I couldn't find them. Could it be we missed the explanation of each rounding mode in the Decimal docs? Or the sprints burned my head? If somebody confirm me that they're not explained, I'll open a bug to myself to do it... Thanks. . Facundo Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/

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getch() in msvcrt does not accept extended characters.
by Darryl Dixon July 1, 2005

July 1, 2005

Hi, I'm sorry, I don't seem to have done a very good job at explaining the situation. I'll try again: 'getch()' is a low-level function provided on Windows to capture a single character of input from a user, /without echoing it to the screen/. As far as I can tell there's no other way of doing this with Python on Windows. The Python interface to this function is in the C code in msvcrtmodule.c, which has a (very thin) wrapper around the raw OS system call. Microsoft provide a way of accepting both normal ASCII codes, and extended characters via this system call. Currently, the Python wrapper in msvcrtmodule.c only supports the semantics of getting the bare ASCII codes, and not the extended characters. I would strongly suggest that it should support both. So, I guess in answer to the questions raised below; 1) I can't do it in Python code without getch() (hence the original email) 2) I would argue that in fact getch() is 'broken' in its current Python implementation, as it doesn't support what the OS implies /should/ be supported (and, indeed, if I input an extended character in response to a 'getch()' call, all I get back currently is an empty string). Finally, I've dug a little deeper, and it looks as though if (ch > UCHAR_MAX) then it would have to call PyUnicode_FromUnicode(s, 1) instead. Is it worth sending in a patch to the sourceforge patch-tracker implementing this? Is it OK for msvcrt_getch to return Unicode when appropriate? Thoughts? Hope this helps, D Fredrik wrote: >Darryl Dixon wrote: > >> Microsoft support capturing extended characters via _getch, but it requires making a >> second call to getch() if one of the 'magic' returns is encountered in the first call (0x00 >> or 0xE0). > >so why not do that in your python code? > >> The relevant chunk of code in Python that would probably need to be >> changed to support this appears to be in msvcrtmodule.c: > >if you change msvcrt, you'll break all the programs that uses getch() in >the prescribed way... > ></F> -- Darryl Dixon <esrever_otua(a)pythonhacker.is-a-geek.net>

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Re: [Python-Dev] cephes module missing
by Delaney, Timothy (Tim) July 1, 2005

July 1, 2005

Justin wrote: > When I used py2exe to create executable file, "cephes" module missing > error occurred. > > I have installed python 2.3 and scientific and numeric python. > > Can anybody suggest me how to resolve the problem? python-dev is for development *of* python, not *with* python. Please direct your questions to <python-list(a)python.org> (or via the newsgroup comp.lang.python). Tim Delaney

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cephes module missing
by Justin July 1, 2005

July 1, 2005

When I used py2exe to create executable file, "cephes" module missing error occurred. I have installed python 2.3 and scientific and numeric python. Can anybody suggest me how to resolve the problem? thanks, Justin --------------------------------- Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football

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how to create single exe dos file
by Justin July 1, 2005

July 1, 2005

Hi All: I have a bundle of python script files (developed based on 2.*) in one application. Is there a way to create a single Dos executable file? thanks, Justin --------------------------------- Yahoo! Mail Mobile Take Yahoo! Mail with you! Check email on your mobile phone.

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