Python的permutations和combinations的区别

permutations(计算列表长度为2的全排序，长度默认为迭代参数的长度):

from itertools import permutations
for aggregate in permutations(range(1,7),2):
    print(aggregate)

permutations取值如图：

combinatinos(计算列表长度为2的所有组合):

from itertools import combinations
for aggregate in combinations(range(1,7),2):
    print(aggregate)

combinations取值如图：