Python 3: zip() is its own inverse!

Python 3.9.0rc1 (default, Aug 12 2020, 00:00:00)
[GCC 10.2.1 20200804 (Red Hat 10.2.1-2)] on linux
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>>> l1 = list(zip(*[('a', 1), ('b', 2), ('c', 3), ('d', 4)]))
>>> l1
[('a', 'b', 'c', 'd'), (1, 2, 3, 4)]
>>> l2 = list(zip(*l1))
>>> l2
[('a', 1), ('b', 2), ('c', 3), ('d', 4)]
>>>