while.py

《python编程金典》书中

#!usr/bin/python
#while.py
number=23
loop=True
while loop:
     guess=int(raw_input("输入一个数"))

     if guess==number:
          print "正确"
          loop=False
     elif guess<number:
          print "小了"
     else:
          print "大了"
else:
     print "程序结束"