python中数学计算

Posted 2020-09-04

用python实现排列组合C(n,m) = n!/m!*(n-m)!  

def get_value(n):  
    if n==1:  
        return n  
    else:  
        return n * get_value(n-1)       
def gen_last_value(n,m):  
     first = get_value(n)  
     second = get_value(m)  
     third = get_value((n-m))  
     return first/(second * third)