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Forum: Python

Feb 19th, 2008, 8:14 AM

Replies: 6

Downloading Tkinter and Wxpython

Views: 341

Posted By ptmcg

Re: Downloading Tkinter and Wxpython

As GameEnder said, tk is bundled with Python, so you should be able to just import it in your scripts and start using it.

Be patient and read the wx download page (GameEnder sent you the link),...

Forum: Show Off Your Open Source Projects

Feb 12th, 2008, 8:23 AM

Replies: 15

www.thefilegarage.com - the world's ultimate file sharing website!

Views: 710

Posted By ptmcg

Re: www.thefilegarage.com - the world's ultimate file sharing website!

Spelling counts, too. The term is "bandwidth", not "brandwidth".

Forum: Show Off Your Open Source Projects

Feb 11th, 2008, 8:50 AM

Replies: 0

pyparsing - Python parser library

Views: 273

Posted By ptmcg

pyparsing - Python parser library

Pyparsing is a Python module for creating parsers. Here is a parser for "Hello, World!", or any string of the form "<greeting>, <person>!":

greeting = Word(alphas) + "," + Word(alphas) + "!"
print...

Forum: Python

Feb 8th, 2008, 9:30 AM

Replies: 7

Other people want to see my programs, how to send them?

Views: 365

Posted By ptmcg

Re: Other people want to see my programs, how to send them?

If you don't care that the whole world can see your program, you can use a pastebin. There are many to choose from, an easy one is http://pastebin.com/. You can even create your own personal...

Forum: Python

Jan 28th, 2008, 5:11 AM

Replies: 6

Object-Oriented Habits

Views: 459

Posted By ptmcg

Re: Object-Oriented Habits

I absolutely agree that it depends on the program.

In general, I use inheritance for modeling similarities in behavior or expectations of the class user. Strictly speaking, this is not required in...

Forum: Python

May 1st, 2007, 5:25 PM

Replies: 4

loops

Views: 253

Posted By ptmcg

If you are looping for the purpose of building a...

If you are looping for the purpose of building a list, read up on list comprehensions. Here is a quick way to build a list of the odd numbers up to 20:

print [c for c in range(20) if c%2 ]

Forum: Python

Apr 10th, 2007, 4:13 PM

Replies: 4

Floating point range

Views: 239

Posted By ptmcg

Out of curiosity, I timed how long a do-nothing...

Out of curiosity, I timed how long a do-nothing for loop takes to iterate 1e9 times. On my 2GHz CPU system, running Python 2.4.1:

for i in xrange(1e9): pass

takes 127.5 seconds. So it is...

Forum: Python

Apr 9th, 2007, 2:27 AM

Replies: 4

Floating point range

Views: 239

Posted By ptmcg

Don't forget range() creates a list of all of the...

Don't forget range() creates a list of all of the entries, so range(1,2,1e-9) would create a billion-entry list. If instead you are trying to iterate a billion times (and I hope you have some time...

Forum: Python

Feb 20th, 2007, 9:17 AM

Replies: 5

Can a button perform two actions?

Views: 252

Posted By ptmcg

:beard: I guess my OO training from...

:beard: I guess my OO training from Smalltalk/C++/Java days is still showing, I instinctively jump to writing a class, especially since Python offers such nice built-in class impersonation features,...

Forum: Python

Feb 19th, 2007, 2:57 PM

Replies: 5

Can a button perform two actions?

Views: 252

Posted By ptmcg

You could create a class that implements __call__...

You could create a class that implements __call__ that takes all of the methods and calls them in turn. Here's a version that returns all of the return values in a list, unless an exception is...

Forum: Python

Feb 18th, 2007, 10:43 AM

Replies: 9

Web Python CGI Tutorial

Views: 531

Posted By ptmcg

I felt a little disoriented at the beginning,...

I felt a little disoriented at the beginning, maybe you need a clearer intro on what you are about to tutor and to whom. Once you got going, the meat of your tutorial looks very clear and helpful. ...

Forum: Python

Jan 31st, 2007, 5:34 AM

Replies: 18

Arithmetic By Percentage

Views: 515

Posted By ptmcg

Just a couple more examples: fica =...

Just a couple more examples:

fica = Percent(7)
fedtax = Percent(15)
medicare = Percent(3)
deductions = fica + fedtax + medicare
gross = 100000
net = gross - deductions
print net # answer: 75000

Forum: Python

Jan 30th, 2007, 5:55 PM

Replies: 18

Arithmetic By Percentage

Views: 515

Posted By ptmcg

Well, once you get the class junk out of the way,...

Well, once you get the class junk out of the way, I'd say this is pretty short/elegant, certainly more along the lines of what the OP was looking for.

discount = Percent(20)
origprice =...

Forum: Python

Jan 30th, 2007, 9:52 AM

Replies: 18

Arithmetic By Percentage

Views: 515

Posted By ptmcg

A Percent class for doing percentage arithmetic

Python's ability to emulate numeric types makes it easy to "extend" Python with some interesting behavior. Here's a Percent class that allows you to write code like: saleprice = origprice -...

Forum: Python

Jun 20th, 2006, 11:28 PM

Replies: 12

Python Parsers

Views: 315

Posted By ptmcg

Sorry you don't find the pyparsing docs to be...

Sorry you don't find the pyparsing docs to be more helpful. I've put more effort into code examples (I think there are about 20 examples now), based on experience that programmers generally prefer...

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