python1加到n

 1 while True:
 2     a = 0
 3     n = input(‘从0开始加到您所输入的数字：‘)
 4     if n.isdigit() == True:
 5         n = int(n)
 6         for i in range(n+1):
 7             a += i
 8         else:
 9             print(‘计算完成，结果为‘, a)
10         s = input(‘输入q退出或者任意字符继续 : ‘)
11         if s == ‘q‘:
12             break
13     else:
14         print(‘请输入正整数！‘)
15 print(‘程序结束！‘)