remove a list from a list

[Rares Vernica]

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.

Thanks,
Ray

Neil Cerutti wrote:
> On 2006-11-17, Rares Vernica <rvernica at gmail.com> 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.
>