25 每日一更

 1 # coding=utf-8
 2 # Created by danding at 2019/10/31
 3 
 4 from math import *
 5 
 6 def jiechenghe(num):
 7     list = []
 8     k = 1
 9     for i in range(1,num+1):
10         k = k*i
11         list.append(k)
12     sum = 0
13     for i in list:
14         sum += i
15 
16     print('前{}项的阶乘和是:{}'.format(num,sum))
17 
18 while 1:
19     try:
20         num = input('提示:输入"q"退出程序。
请输入前几项数字的阶乘和:')
21         if num.lower()=='q':
22             break
23         num = int(num)
24     except:
25         print('请输入数！')
26         continue
27     jiechenghe(num)