1. 调用 scipy 计算排列组合的具体数值
from scipy.special import comb, perm
A = perm(3, 2)
# out：A = 6.0
C = comb(3, 2)
# out： C = 3.02. 调用 itertools 获取排列组合的全部情况
from itertools import combinations, permutations
itering = permutations([1, 2, 3], 2)
Alist = list(itering)
# out: Alist = [(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
itering = combinations([1, 2, 3], 2)
Clist = list(itering)
# out: Clist = [(1, 2), (1, 3), (2, 3)]
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