filter function question - list processing in Python

lobozc at my-deja.com lobozc at my-deja.com
Tue Nov 23 22:34:10 CET 1999


How should I pass additional parameter in 'filter'? 'map' has them,
filter doesn't - why? Say I have a list ['xxx.py','xxx.pyc'] and I want
to have a function isExtension(x,'.py') - which I can call with various
extensions to filter the list in variuos ways - how am I supposed to do
that? [No, I'm not interested in using lambda here in general].

In general, I note that Python has some standard functions operating on
lists but they are curiously limited. It is a pity, since these are the
functions which reduce line count significantly - as well as make
programming safer. I wonder what are the chances of repeating with
lists what Python did with regular expressions - copying the
functionality from a well tested and popular product?

Mathematica has a set of list processing functions. As one can expect
from an essentially functional language and a product where most
operations are done by list processing - for the last 10 years - this
set is well thought out, complete and very, very useful.

[For description see
http://documents.wolfram.com/v4/frames/frames.html, press button 'built-
in functions', on the leftmost panel 'programming', to the right of it
press 'functional programming' - eventually look for functions like
Map, Fold, Apply etc.].




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