"in" operator for strings

Ruediger Soerensen soerense at verwaltung.uni-mainz.de
Thu Feb 1 16:01:47 CET 2001


>This is exactly one of my current puzzles: How to can I compare that a set is
>a subset of another, larger, set efficiently? Say I have to perform such a
>comparison some 100000 times, it would come in very handy to write
>
>(assume all_sets is a list of 100000 sets (i.e. lists))
>
>for set in all_sets:
>	if [1,2,50] in set:
>		do_something
>
>any good suggestion?


What about this:

def inset(subset,set):
    for u in subset:
        if not u in set:
            return 0
    return 1


print inset([1,3],[1,2,3,4])
print inset([1,8],[1,2,3,4])



-- 
Rüdiger "Black Hole" Sörensen || soerense at verwaltung.uni-mainz.de



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