n的阶乘求和 python

以下是两种Python计算n的阶乘求和的方法：

1.使用递归函数计算n的阶乘和

import numpy as np
import pandas as pd
from numpy import *

def Recursive(n):
    n = int(n)
    sum = 0
    chengji = 1
    for i in range(1,n+1):
        chengji = chengji*i
        sum += chengji
    print('%d! 的和是 %d ' % (n, sum))

if __name__ == '__main__':
    print("这个程序是计算n阶阶乘和")
    num = input("请输入阶数：")
    Recursive(num)

2.使用循环和递归函数计算n的阶乘和

def fac(m):
    if m==0:
        return 1
    else:
        return (m*fac(m-1))

n=int(input())
s=0
for i in range(1,n+1):
    s +=fac(i)
print(s)