python 从m个数中取n个做不重复排列

需要用到itertools.combinations方法

m也可以是list,tuple，dict等对象

from itertools import combinations
m =['1', '2', '3', '4', '5', '6', '7']
c = 0
n=6
for i in list(combinations(m,n)):
    print(i)
    c=c+1
print(c)