Xah Lee wrote: > is there a way to condense the following loop into one line? > > # -*- coding: utf-8 -*- > # python > > import re, os.path > > imgPaths=[u'/Users/t/web/Periodic_dosage_dir/lanci/t4/oh/DSCN2059m-s.jpg', > u'/Users/t/web/Periodic_dosage_dir/lanci/t4/oh/DSCN2062m-s.jpg', > u'/Users/t/web/Periodic_dosage_dir/lanci/t4/oh/DSCN2097m-s.jpg', > u'/Users/t/web/Periodic_dosage_dir/lanci/t4/oh/DSCN2099m-s.jpg', > u'/Users/t/web/Icons_dir/icon_sum.gif'] > > # change the image path to the full sized image, if it exists > # that is, if image ends in -s.jpg, find one without the '-s'. > temp=imgPaths[:] > imgPaths=[] > for myPath in temp: > p=myPath > (dirName, fileName) = os.path.split(myPath) > (fileBaseName, fileExtension)=os.path.splitext(fileName) > if(re.search(r'-s$',fileBaseName,re.U)): > p2=os.path.join(dirName,fileBaseName[0:-2]) + fileExtension > if os.path.exists(p2): p=p2 > imgPaths.append(p) > > temp=[] > print imgPaths
this is of interest to me, because i wanted to illustrate functional programing, and Python's short-coming of it. (if you go to wikipedia and read the article on Python, it will proudly say that Python supports functional programing. A huge fucking lie. (more fantastic fucking lies in the Perl article. And it is impossible to correct them, because there is an army of ignorant morons, usually militant too, not shy to do justice for humanity with heartiness.) ) In functional programing proper, the following loop for example would be a single line. Why? because in fp, one is focused on the input & output and less on the details how it is done. So here, one simply reads the comment there and that'd be it. The one-line code would be in the form of impPaths = f(impPaths), where f is a function made on the spot. So, in fp the source code tends to take the form of paragraphs of algorithmic units, as opposed one million lines of code filling the page. I would have, written the following in a one-line. But in Python this is impossible. (if possible, probably something so unusual and unreadable) ... Here we may want to make a note on what does it mean to say that a programing language supports functional programing. The FP style, basically means that one writes pure functions and apply them to expressions. That is, subroutines whose behavior are purely that of input and output. (i.e. so-called without side-effects) But if one programs in FP style, certain patterns of coding emerges. For example, a lambda construct, sequencing of functions, assigning and moving of functions, application of functions etc, and such languages naturally developed many features in that direction such as types, macros, many specialized loop constructs (recursion, nesting) and many other features that goes by abstruse names...etc. so here, if we judge Python (or Perl), why should we say it supports functional programing? Simply because it is possible to define subroutines without side-effects? What else, really, functional language features does Python support? Can we really say, that a functional programing coming to Python will find it reasonably supports his FP coding style? I would like to see the “also support functional programing” removed in the wikipedia Python article. ( http://en.wikipedia.org/wiki/Python_programming_language ) (Perl the language, can arguably be said to support some functional programing. (those Schwatchzian etc Transform for example, is a epitome of functional programing.) However, Perl does not support Object-Oriented programing.) The Perl article is filled with more egregious lies. (In the past year) I've tried to mend the article about every 3 months or so, tentatively on obvious and technical and non-controversial items that's purely propaganda but got denied by the Perl fuckfaces. I have written a full page of criticism but the human animal fuckers handily censored it too. If you think i have a point, please add this link to the Perl page's external links. http://xahlee.org/UnixResource_dir/perlr.html (book review and criticism on Perl & community) Xah [EMAIL PROTECTED] ∑ http://xahlee.org/ -- http://mail.python.org/mailman/listinfo/python-list
