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