13 阶乘之和

 1 def f(x):
 2     if x == 0:
 3         return 0
 4     elif x == 1:
 5         return 1
 6     else:
 7         return (x * f(x - 1))
 8 while 1:
 9     info = int(input(‘>>>:‘))
10     print(f(info))
11     print(‘还想试试吗？(输入no退出)‘)
12     info = input(‘>>>:‘)
13     if info == ‘no‘:
14         break
15     info1 = int(info)
16     print(f(info1))