remove a list from a list

Rares Vernica rvernica at
Sat Nov 18 00:39:19 CET 2006

The problem with skipping over them is that "walk" would still walk them 
and their content. If they have a lot of other dirs and files inside 
then this might end up being time consuming.


Neil Cerutti wrote:
> On 2006-11-17, Rares Vernica <rvernica at> wrote:
>> Sorry for not being clear from the beginning and for not using
>> clear variable names.
>> Problem context:
>> import os
>> dirs_exclude = set(('a', 'b', 'e'))
>> for root, dirs, files in os.walk('python/Lib/email'):
>>      # Task:
>>      # delete from "dirs" the directory names from "dirs_exclude"
>>      # case-insensitive
>> The solution so far is:
>> for i in xrange(len(dirs), 0, -1):
>>    if dirs[i-1].lower() in dirs_exclude:
>>      del dirs[i-1]
>> I am looking for a nicer solution.
> I'd probably just skip over those dirs as I came them instead of
> troubling about mutating the list. Unless the list is needed in
> more than one place.

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