[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: ... > Why wouldn't "the one obvious way" be: > > def inAnotB(A, B): > inA = set(os.listdir(A)) > inBs = set(os.listdir(B)) > return inA.difference(inBs)
If you want a set as the result, that's one possibility (although possibly a bit wasteful as you're building one more set than necessary); I read the original request as implying a sorted list result is wanted, just like os.listdir returns (possibly sorted in case-independent order depending on the underlying filesystem). There's no real added value in destroying inA's ordering by making it a set, when the list comprehension just "naturally keeps" its ordering. Alex -- http://mail.python.org/mailman/listinfo/python-list
