Python | sympy.nP()方法
借助 sympy.nP() 方法，我们可以计算出给定长度在 sympy 中的置换数。
语法: nP(项，k)
参数: 项–要计算排列的整数、列表或字符串。 k–指定排列长度的整数。
返回:返回给定长度的置换数。
示例#1:
# import sympy
from sympy import *
items = "abca"
k = 3
print("Value of k = {} and the items are = {}".format(k, items))
# Use sympy.nP() method
permutations = nP(items, k)
print("Permutation : {}".format(permutations))
输出:
Value of k = 3 and the items are = abca
Permutation : 12
例 2:
# import sympy
from sympy import *
items = [2, 1, 3, 5, 4]
k = 3
print("Value of k = {} and the items are = {}".format(k, items))
# Use sympy.nP() method
permutations = nP(items, k)
print("Permutation : {}".format(permutations))
输出:
Value of k = 3 and the items are = [2, 1, 3, 5, 4]
Permutation : 60
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