求1！+2！+3！+……n！的和用python

Question

用for语句

来

Answer 1

参考代码如下： 

x = input('请输入一个数：')

sum = 0
for i in range(1, int(x)+1, 1):
    j = i
    num = 1
    for k in range(1, j+1):
        num *= k
    sum += num

print(sum)