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turing4ever/gen_list_of_duplicate_items.py

Created August 19, 2018 05:18
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Duplicate a list in python
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gen_list_of_duplicate_items.py
# if e is immutable
[e] * n
# [e] is mutable
list_of_list = [[e] for _ in range(n)]
# if you do [e] * n, you will get n references to the same [e]
foo = [[]] *4
foo[0].append('x')
[['x'], ['x'], ['x'], ['x']]
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