35 lines
645 B
Python
35 lines
645 B
Python
|
#!/usr/bin/env python
|
||
|
|
# -*- encoding: utf-8 -*-
|
||
|
|
"""
|
||
|
|
Topic: 排列组合迭代
|
||
|
|
Desc :
|
||
|
|
"""
|
||
|
|
from itertools import permutations
|
||
|
|
from itertools import combinations
|
||
|
|
from itertools import combinations_with_replacement
|
||
|
|
|
||
|
|
|
||
|
|
def iter_permutation():
|
||
|
|
"""排列组合"""
|
||
|
|
|
||
|
|
items = ['a', 'b', 'c']
|
||
|
|
|
||
|
|
# 全排列
|
||
|
|
for p in permutations(items):
|
||
|
|
print(p)
|
||
|
|
|
||
|
|
# 指定长度
|
||
|
|
for p in permutations(items, 2):
|
||
|
|
print(p)
|
||
|
|
|
||
|
|
# 组合
|
||
|
|
for c in combinations(items, 3):
|
||
|
|
print(c)
|
||
|
|
|
||
|
|
# 可重复组合
|
||
|
|
for c in combinations_with_replacement(items, 3):
|
||
|
|
print(c)
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
iter_permutation()
|