[Tutor] Question regarding list editing (in place)
bgailer at alum.rpi.edu
Tue Feb 5 20:15:40 CET 2008
David J. Weller-Fahy wrote:
> Let me know if this should be on the general python list.
> I'm playing with some python to iterate over a directory structure. Part
> of the directory structure should be ignored, and will have a period (.)
> as the first character of the directory name.
> My solution was to use the following code.
> for root, dirs, files in os.walk(data_dir()):
> for n in xrange(len(dirs) - 1, -1, -1):
> if dirs[n].startswith(u'.'):
> del dirs[n]
> This works. But I'm wondering whether there is a simpler solution (rather
> than walking the index backwards through the list) to removing items from
> a list without replacing the list? Specifically, I'm looking for
> something that would be similar to the concept, "Remove every list item
> that starts with X."
dirs = [dir for dir in dirs if not dir.startswith(u'.')]
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