I want to take two lists and find the values that appear in both.
a = [1, 2, 3, 4, 5] b = [9, 8, 7, 6, 5] returnMatches(a, b)
would return [5]
, for instance.
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Answer
Not the most efficient one, but by far the most obvious way to do it is:
>>> a = [1, 2, 3, 4, 5] >>> b = [9, 8, 7, 6, 5] >>> set(a) & set(b) {5}
if order is significant you can do it with list comprehensions like this:
>>> [i for i, j in zip(a, b) if i == j] [5]
(only works for equal-sized lists, which order-significance implies).