<[EMAIL PROTECTED]> wrote:
...
> In my case of have done os.listdir() on two directories. I want to see
> what files are in directory A that are not in directory B.
So why would you care about WHERE, in the listdir of B, are to be found
the files that are in A but not B?! You should call .index only if you
CARE about the position.
def inAnotB(A, B):
inA = os.listdir(A)
inBs = set(os.listdir(B))
return [f for f in inA if f not in inBs]
is the "one obvious way to do it" (the set(...) is just a simple and
powerful optimization -- checking membership in a set is roughly O(1),
while checking membership in a list of N items is O(N)...).
Alex
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