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while语句在一个条件为真的情况下,while语句允许你重复执行一块语句。直接看例子:- #!/usr/bin/python
- # Filename: while.py
- number = 23
- running = True
- while running:
- guess = int(raw_input('Enter an integer : '))
- if guess == number:
- print 'Congratulations, you guessed it.'
- running = False # this causes the while loop to stop
- elif guess < number:
- print 'No, it is a little higher than that'
- else:
- print 'No, it is a little lower than that'
- else:
- print 'The while loop is over.'
- # Do anything else you want to do here
- print 'Done'
复制代码 当输入23时,程序执行done,结束,否则一直在循环(当然输入非整数时语法错误,程序会跳出的)。
运行结果:- $ python while.py
- Enter an integer : 50
- No, it is a little lower than that.
- Enter an integer : 22
- No, it is a little higher than that.
- Enter an integer : 23
- Congratulations, you guessed it.
- The while loop is over.
- Done
复制代码 //这里要说明的是python语言对空格要求的很严格,必须是对应的,否则语法是不正确的。 |
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