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naotokui/list_to_set_ordered.py

Last active May 10, 2017 05:55
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list -> set in python remove duplication while preserving the original order
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list_to_set_ordered.py
a = [5, 1, 3, 5, 4, 2, 10, 7, 8, 0, 1, 3]
# list -> set : remove duplication
print list(set(a)) # [0, 1, 2, 3, 4, 5, 7, 8, 10]
# list -> set while preserving original order
b = sorted(set(a), key=a.index) # [5, 1, 3, 4, 2, 10, 7, 8, 0]
# if the list is very very long and performance matters, use more_itertools
# pip install more_itertools
from more_itertools import unique_everseen
b = list(unique_everseen(a))
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