itertools examples

itertools.py

# -*- coding: utf-8 -*-

from itertools import permutations, combinations, chain


for p in permutations([1, 2, 3]):
    print(p)
# (1, 2, 3)
# (1, 3, 2)
# (2, 1, 3)
# (2, 3, 1)
# (3, 1, 2)
# (3, 2, 1)

for c in combinations([1, 2, 3, 4], 2):
    print(c)
# (1, 2)
# (1, 3)
# (1, 4)
# (2, 3)
# (2, 4)
# (3, 4)

for ch in chain(range(3), range(12, 15)):
    print(ch)
# 0
# 1
# 2
# 12
# 13
# 14