John Salerno wrote:
> I'd like to compare the values in two different sets to test if any of
> the positions in either set share the same value (e.g., if the third
> element of each set is an 'a', then the test fails).
>
> I have this:
>
> def test_sets(original_set, trans_letters):
> for pair in zip(original_set, trans_letters):
> if pair[0] == pair[1]:
> return False
> return True
>
>
> zip() was the first thing I thought of, but I was wondering if there's
> some other way to do it, perhaps a builtin that actually does this kind
> of testing.
>
> Thanks.
'enumerate' is another possibility:
s1 = 'abcd'
s2 = 'zzzz'
s3 = 'zbzz'
s4 = 'zzbz'
def are_itemwise_different( L1, L2 ):
#if len(L1) != len(L2): return True
for idx, value in enumerate(L1):
if value == L2[idx]:
return False
return True
#after Peter Otten
def are_itemwise_different( L1, L2 ):
#if len(L1) != len(L2): return True
return True not in ( value == L2[idx] for idx, value in
enumerate(L1) )
assert are_itemwise_different(s1,s2)
assert not are_itemwise_different(s1,s3)
assert are_itemwise_different(s1,s4)
def itemwise_intersect( L1, L2 ):
#if len(L1) != len(L2): raise
for idx, value in enumerate(L1):
if value == L2[idx]:
yield value
assert list(itemwise_intersect(s1,s2)) == []
assert list(itemwise_intersect(s1,s3)) == ['b']
assert list(itemwise_intersect(s1,s4)) == []
Gerard
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