Python | sympy.nC()方法
借助 sympy.nC() 方法，可以计算出 sympy 中给定长度的组合个数。
语法: nC(项，k)
参数: 项目–要计算组合的整数、列表或字符串。 k–指定组合长度的整数。
返回:返回给定长度的组合数。
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.nC() method
combinations = nC(items, k)
print("Combinations : {}".format(combinations))
输出:
Value of k = 3 and the items are = abca
Combinations : 3
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.nC() method
combinations = nC(items, k)
print("Combinations : {}".format(combinations))
输出:
Value of k = 3 and the items are = [2, 1, 3, 5, 4]
Combinations : 10
