Python | sympy .二项式_系数()方法
借助于辛二项式系数()方法，我们可以求出给定整数的二项式系数。该方法返回一个字典，其中包含对
，其中
是二项式系数，
。
语法:二项式系数(n)
参数: n–表示整数。
返回:返回包含对(k1，k2)的字典:C k n 其中 CkT8】n 为二项式系数，n = k1 + k2。
示例#1:
# import binomial_coefficients() method from sympy
from sympy.ntheory import binomial_coefficients
n = 6
# Use binomial_coefficients() method
binomial_coefficients_n = binomial_coefficients(n)
print("binomial_coefficients({}) = {} ".format(n, binomial_coefficients_n))
输出:
binomial_coefficients(6) = {(3, 3): 20, (1, 5): 6, (6, 0): 1, (0, 6): 1, (4, 2): 15, (5, 1): 6, (2, 4): 15}
例 2:
# import binomial_coefficients() method from sympy
from sympy.ntheory import binomial_coefficients
n = 9
# Use binomial_coefficients() method
binomial_coefficients_n = binomial_coefficients(n)
print("binomial_coefficients({}) = {} ".format(n, binomial_coefficients_n))
输出:
binomial_coefficients(9) = {(2, 7): 36, (9, 0): 1, (8, 1): 9, (5, 4): 126, (6, 3): 84, (4, 5): 126, (1, 8): 9, (3, 6): 84, (0, 9): 1, (7, 2): 36}
