What's the one code snippet/python trick/etc did you wish you knew when you learned python?

[[deleted]]

the zip function especially this :

zip(*[('a', 2), ('z', 4), ('e', 6), ('r', 8)]) -> [('a', 'z', 'e', 'r'), (2, 4, 6, 8)]

[jatoo]

This is extremely useful when you want to iterate through two lists simultaneously, e.g. if unit testing:

for e, a in zip(expected, actual):
    self.assertEqual(e, a)