python1+..+100

# -*- coding: cp936 -*-
y = "yes"
while y == "yes":
           print "please input num"
           a = input()
           print "please input endnum"
           c = input()
           b=a+1
           while b<=c:
               a=a+b
               b=b+1
           print ‘答案为：‘ ; print a
           #y = "no"                        #取消“#”就是控制循环
           print "go on!? (yes or no)："
           #y = raw_input()   #把输入结果作为字符串给予变量y

python1+..+100