🌐 Mailman 3 December 2003 - Python-list - python.org

Tkinter
by km Dec. 31, 2003

Dec. 31, 2003

Hi all, I am in need of some sample scripts which cover vital issues of starting Tkinter with Python. Can somebody provide me with such links ? thanks in advance, regards, KM

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Re: Programming language from python
by Irmen de Jong Dec. 31, 2003

Dec. 31, 2003

Alejandro Lombardo wrote: > Dear sirs: > > I need to create a programming language. Can this be done with the > latest version of python? Yes, sure! > Is python the best computer programming > language development tool in the entire universe? If it isn´t could you > please tell me the name of the best computer programming language > development tool in the entire universe? While Python approaches this almost, I believe the Sqiwrnsyivstblz++ toolkit, available on the third rock circling Betelgeuse, is highly superior at the moment. > So that I can download it from > the Internet for free? I would apreciate it if you could answer these > questions as soon as posible. I'm sorry, the inhabitants of the Betelgeuse system have discarded the Internet long ago in favor of a much better communication system based on tachyons, and bad news (because, as you know, there are only two things in the universe that travel faster than light: tachyons and bad news). Have fun with Python instead. ;-) --Irmen de Jong

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position in a for loop?
by EP Dec. 31, 2003

Dec. 31, 2003

In fear of bringing down the quality of the list, I nevertheless will ask: How I can tell where I am in a for loop? I think I am working way too hard to try to determine this - there is probably a very simple way to know? Spam_locations=[] list=['linguine','Spam', 'clams', 'Spam', 'steak', 'onions', 'apples', 'Spam'] for food in list: if food='Spam': Spam_location.append(## position in list ##) ## but how do I back reference the position in the for loop? I am hoping to get: >>> Print Spam_locations [1,3,7] I was thinking the back reference might be something like: Spam_location.append(list.__iter__()) But that gives me <listiterator object at 0x00DBE3B0> not a value (position)... I promise to be smarter next year... any help? EP

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Re: Formal reference for Python
by Terry Reedy Dec. 31, 2003

Dec. 31, 2003

"Tim Churches" <tchur(a)optushome.com.au> wrote in message news:mailman.65.1072845144.8134.python-list@python.org... > I am writing a scientific paper and need to reference Python. Is there any > preferred way of doing so, which gives credit where it is due? This has been > discussed previously, but not recently, I think. > > The latest version of R (a free, open source language/environment for statistical > analysis) includes a citation() function, which returns the canonical citation for R > as defined by the core R development team. Worth emulating in Python? How about Guido van Rossum, Python Reference Manual, Python Software Foundation, http://www.python.org/doc/current/ref/ref.html, 2003 tjr

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Building Py2Exe from source
by kylotan＠hotmail.com Dec. 31, 2003

Dec. 31, 2003

I need to be able to build Py2Exe from the source code as I am making a Windows executable where I wish to preprocess the modules before importing them.It looks like I can do this by adding lines to Load_Module() in py2exe's start.c. However problem I have is that I can't build Py2Exe using the instructions provided. Using the designated command of "python setup.py install" I get this error: Traceback (most recent call last): File "setup.py", line 340, in ? raise RuntimeError, msg RuntimeError: PYWIN32DIR invalid. To build py2exe from source, you must either: - Download and build Mark Hammond's pywin32 source code from http://starship.python.net/crew/mhammond, and set the PYWIN32DIR variable to point to this directory - or change this setup script to not build run_svc target, then you will not be able to build Windows NT services with py2exe. The main problem I encountered is that the 2nd option appears misleading: removing run_svc from the list of targets does no good as it still attempts to find some sort of "win32" directory before it even gets that far. Or maybe I'm missing something. If option 1 requires following these arduous-looking instructions: <http://starship.python.net/crew/mhammond/win32/BuildingExtensions.html> then I'd rather bypass that if at all possible. :) I only need to build standard executables, not DLLs, NT services, or anything to do with COM. Any help getting around this problem would be much appreciated. (Platform: Win98SE, Python 2.3.3.) -- Ben Sizer

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Formal reference for Python
by Tim Churches Dec. 31, 2003

Dec. 31, 2003

I am writing a scientific paper and need to reference Python. Is there any preferred way of doing so, which gives credit where it is due? This has been discussed previously, but not recently, I think. The latest version of R (a free, open source language/environment for statistical analysis) includes a citation() function, which returns the canonical citation for R as defined by the core R development team. Worth emulating in Python? Tim C

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Re: Storing objects required by functions.
by aahz＠pythoncraft.com Dec. 31, 2003

Dec. 31, 2003

In article <mailman.58.1072824331.8134.python-list(a)python.org>, Jp Calderone <exarkun(a)intarweb.us> wrote: > >It's a PGP signature. If the mail client you're using can't extricate the >plaintext part, I'd say it isn't a very good mail client. (Even mailman's >archiver deals with them the right way these days ;) I'm using netnews, not e-mail. PGP doesn't belong in netnews posts, IMO. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Weinberg's Second Law: If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization.

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Storing objects required by functions.
by dw-google.com＠botanicus.net Dec. 31, 2003

Dec. 31, 2003

Further to my last post here, I was playing some more with building a regex object and storing it somewhere for use internally by a function. I'm not happy with any of my solutions: # I don't like this, but the fact that you can modify the procedure's # function via a named argument seems neat in a hacky sort of way. def uses_default_parm_yuck(x, r = re.compile("...")): pass g = re.compile('...') def uses_global_yuck(x): global g pass # This is horrible and probably slow. class is_hex: def __init__(self): self.r = re.compile('...') def __call__(self, x): r = self.r pass is_hex = is_hex() # This mucks up scoping so that your procedure can't access it's # parent scope like it could normally. Since I never do this, # it's my favourite. def is_hex(): r = re.compile('...') def is_hex(s): return r.match(s) is not None return is_hex is_hex = is_hex() Am I missing something? Is there a nicer way of doing this? On a day to day basis I find myself in this situation quite regularly, and now I come to think of it today, it is something that I would like to improve. It is funny that in private it has never bothered me much, but when posting on comp.lang.python I find that the code is unacceptable. Maybe I have two modes of programming, idealist and practical? *shrug* :) David.

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NEWBIE: Sub-Classes
by engsolnom＠ipns.com Dec. 31, 2003

Dec. 31, 2003

I'm a bit baffled. In the code below, I expected that the import in tst_sub.py would expose all the contents of dir_a.py. But, as it turns out...it doesn't. I can understand (I think) why B has to be qualified in class A(dir_a.B), but why is dir_a.B.class_B required? Also, how can I expose self.B_self to A? Thanks......Norm DIRECTORY DIRA: DIR_A.PY: var = 13 class B: class_B = 21 def __init__ (self): self.B_self = 31 def B_meth_1(self): self.class_B = 19 DIRECTORY MYFILES: TST_SUB.PY: import dir_a print dir_a.var class A(dir_a.B): def __init__ (self): self.B_meth_1() # Run the base class B method self.class_a = self.class_B # Gets the value in B_meth_1 self.class_aa = dir_a.B.class_B # Gets B's 'static' var print self.class_a print self.class_aa # Prints 13 obj_1 = A() # Prints 19, 21 obj_2 = A() # Prints 19, 21 showing A.__init__() was run again

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selecting a random item from a set
by Alexander Schmolck Dec. 31, 2003

Dec. 31, 2003

Quite a few algortihms prominently feature choosing/removing a single random element from a set at a time. On first sight I can't think of anything better to achieve this with `sets.Set` than something along the lines of: for dummy, randomElement in zip(range(randrange(len(s)+1)), s): pass # possibly followed by s.remove(randomElement) Is there a better way? If not, how about something like Set.randompop()? 'as

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