gmane.comp.python.general

Re: 2d graphics - what module to use?

King — 2008-07-25T08:10:52

Use python's default GUI tkinter's drawing functions or you can use wxPython GUI kit or you can use pyopengl. If you are only interested to draw sin waves or math functions that you should give try to matlab at www.mathworks.com -- http://mail.python.org/mailman/listinfo/python-list

Re: ctypes and reading value under pointer passed as param of a callback

waldek — 2008-07-25T08:06:32

Cool, works fine now. ... and how to convert a list of bytes to py string or int ?? i.e data[:4] -> py int data[4:8] -> py int data[8:] -> py strng I tried unpack and unpack_from but the buff should be an string or buffer not a list of bytes as data is. any suggestions? -- http://mail.python.org/mailman/listinfo/python-list

Re: file operations.

Fredrik Lundh — 2008-07-25T07:57:58

(I'm sure you mean "a question"; in english, "a doubt" is something slightly different, and quite often more negative.) print repr(line) # added for debugging! one or more lines in your file doesn't match the description; try adding a print statement (see above) to see what they might look like, and make sure that you filter them out (e.g. by checking the size of the list you get from the split, as Terry explains). -- http://mail.python.org/mailman/listinfo/python-list

Re: Attack a sacred Python Cow

Nikolaus Rath — 2008-07-25T07:54:30

Why do you think that 'self' should be inserted anywhere except in the arg list? AFAIU, the idea is to remove the need to write 'self' in the arg list, not to get rid of it entirely. Best, -Nikolaus

Re: os.walk question

Fredrik Lundh — 2008-07-25T07:48:51

sure, as was discussed in this very thread two days ago. -- http://mail.python.org/mailman/listinfo/python-list

Re: import dll instead of pyd

Fredrik Lundh — 2008-07-25T07:20:16

looks like that was removed in 2.5; from Misc/NEWS: - On Windows, .DLL is not an accepted file name extension for extension modules anymore; extensions are only found if they end in .PYD. which is easily confirmed: Python 2.4.3 >>> import imp >>> imp.get_suffixes() [('.pyd', 'rb', 3), ('.dll', 'rb', 3), ('.py', 'U', 1), ('.pyw', 'U', 1), ('.pyc', 'rb', 2)] Python 2.5 >>> import imp >>> imp.get_suffixes() [('.pyd', 'rb', 3), ('.py', 'U', 1), ('.pyw', 'U', 1), ('.pyc', 'rb', 2)] (the DLL support was a compatibility thing anyway, so I guess removing it after 10+ years is a reasonable thing to do...) -- http://mail.python.org/mailman/listinfo/python-list

Re: need help with introducing more traffic

leo davis — 2008-07-25T06:58:24

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Re: import dll instead of pyd

jrh — 2008-07-25T06:51:03

Yes it is in the same directory. The problem is it does not seem to look for dll's at all. So is this by design, or am I missing something? On 25 Juli, 10:03, Nick Dumas gmail.com> wrote: -- http://mail.python.org/mailman/listinfo/python-list

Re: Function editing with Vim throws IndentError

Timothy Grant — 2008-07-25T06:32:40

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2d graphics - what module to use?

Pierre Dagenais — 2008-07-25T06:13:30

What is the easiest way to draw to a window? I'd like to draw something like sine waves from a mathematical equation. Newbie to python. -- http://mail.python.org/mailman/listinfo/python-list

Questions on 64 bit versions of Python

2008-07-25T06:13:44

Background: I'm going to be processing some raw transaction logs that are 30G in size. As part of this processing I may need to create some very large dictionary structures. I will be running my scripts on a version of Windows 2003 Server Enterprise Edition that supports 16G of RAM. Yes, I could use a database in place of dictionaries, but I'm looking for maximum performance. The following page lists two 64 bit versions of Python for Windows: http://www.python.org/download/releases/2.5.2/ For Win64-Itanium users: python-2.5.2.ia64.msi For Win64-AMD64 users: python-2.5.2.amd64.msi 1. It looks like the 64 bit versions of Python for Windows are CPU vendor specific, eg. it doesn't look like there's a single, universal executable for Windows 64 bit platforms. Is this true? 2. Are there limitations to the using the 64 bit versions of Python? I seem to remember reading that many 3rd party modules (especially Windows OS specific modules) may not be compatible with the 64 bit versions of Python for Windows. 3. If I wanted to run a 64 bit version of Python under Linux, would I need to recompile from source on 64 bit version of Linux or do 64 bit versions of Linux automatically ship with 64 bit versions of Python? (Any recommendations on a flavor of 64 bit of Linux for the Intel architecture would be appreciated) 4. Is there a stable version of IronPython compiled under a 64 bit version of .NET? Anyone have experience with such a beast? Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list

Re: Attack a sacred Python Cow

2008-07-25T06:09:09

On Jul 24, 5:01 am, Lawrence D'Oliveiro geek- central.gen.new_zealand> wrote: By that logic, C++ is not OO. By that logic, Ruby is not OO. By that logic, I know of only one OO language: Java :) The fact that a language doesn't force you to do object-oriented programming doesn't mean that it's not object-oriented. In other words, your words are nonsense. Sebastian -- http://mail.python.org/mailman/listinfo/python-list

Re: pci card adjusting

Tim Roberts — 2008-07-25T05:59:54

Not easily, at least not without a helper DLL in C. And since the app won't be that large, you might as well just do it in C.

Re: Doubt

Michael Torrie — 2008-07-25T05:37:50

As other pointed out, iterating through a list or range is often a far more elegant way to do a loop than a C-style loop. But the C-style for loop is just syntactic sugar for a while loop. In some cases, C-style for loops can have an initializer, a set of conditions, and incrementer parts that are all based on different variables. For example: for (a=begin_func() ; x < 3 and sometest(b) ; i=somefunc() ) This highly illogical and contrived function could not be represented in python with a simple "for x in blah" statement. Rather you have to represent it in its true form, which is a while loop: a=begin_func() while x < 3 and sometest(b): #do stuff #loop body i=somefunc() In fact, the perl/c for loop of the form: for (;;) always translates directly to: while : #loop body -- http://mail.python.org/mailman/listinfo/python-list

Re: Broken examples

Tim Roberts — 2008-07-25T05:33:59

Excel is a COM-driven application. You have to drive it through the object model. import win32com.client excel = win32com.client.Dispatch( 'Excel.Application' ) xlCSV = 6 ... for nm in list_of_file_names: csv = os.path.splitext( nm )[0] + '.csv' wb = excel.Workbooks.Open( nm ) wb.SaveAs( csv, xlCSV ) wb.Close() If you want to watch the progress, add "excel.Visible=1" after the dispatch.

object persistency, store instances relationship externally

King — 2008-07-25T05:33:01

This is a new test for object persistency. I am trying to store the relationship between instances externally. It's not working as expected. May be I am doing it in wrong way. Any suggestions? import shelve class attrib(object): pass class node(object): def __init__(self): self.a = attrib() self.b = attrib() self.c = attrib() self.d = attrib() a = node() #store pair relationship. This relationship is created at run time. lst = [[a.a, a.b], [a.c, a.d]] #Write objects into file shelf = shelve.open('shelve_test_01.txt', writeback=True) shelf['node'] = a shelf['lst'] = lst shelf.sync() shelf.close() #Read objects from file shelf = shelve.open('shelve_test_01.txt', 'r') a = shelf['node'] lst = shelf['lst'] print a.a, a.b, a.c, a.d #lst does not contains the relationship of object 'a''s attributes, instead it's creating new instances #of 'attrib' class print lst -- http://mail.python.org/mailman/listinfo/python-list

Re: Attack a sacred Python Cow

Kay Schluehr — 2008-07-25T05:06:35

This isn't the problem Jordan tries to address. It's really just about `self` in the argument signature of f, not about its omission in the body. Some problems occur when not `self` shall be used but e.g. `this`. Here one has to specify more: class C(): __self__ = 'this' # use `this` instead of `self` def f(a): this.a = a or class C(): def f($this, a): # use `this` instead of `self` this.a = a When an $-prefixed parameter is found the automatic insertion of `self` will be blocked and the $-prefixed parameter name will be used instead but without the prefix. -- http://mail.python.org/mailman/listinfo/python-list

Re: Question about inheritence

Lawrence D'Oliveiro — 2008-07-25T04:44:35

In message python.org>, Fredrik Lundh wrote: That's the usual meaning of "constructor". It doesn't actually "construct" the object, it really "initializes" it. -- http://mail.python.org/mailman/listinfo/python-list

Re: os.walk question

Lawrence D'Oliveiro — 2008-07-25T04:38:45

In message python.org>, Fredrik Lundh wrote: Won't that return any subdirectories as well as files? -- http://mail.python.org/mailman/listinfo/python-list

Re: Broken examples

Lawrence D'Oliveiro — 2008-07-25T04:36:47

In message python.org>, norseman wrote: I've never tried that. I've run Python scripts from the "Tools/Macros/Run Macro..." dialog. -- http://mail.python.org/mailman/listinfo/python-list

Re: Attack a sacred Python Cow

Lawrence D'Oliveiro — 2008-07-25T04:33:51

In message <8233fbfb-ad9b-43ef-b722-9738ef129d0b< at >q5g2000prf.googlegroups.com>, Jordan wrote: That would mean making OO the default. Which Python doesn't do. -- http://mail.python.org/mailman/listinfo/python-list