#/usr/bin/python 
#coding=utf-8 
#@Time   :2017/10/18 15:31 
#@Auther :liuzhenchuan 
#@File   :while 循環.py

示例1：

1 n = 0
2 while True:
3     print ‘hello world‘
4     if n == 10:
5         break
6     n +=1

打印如下：

 1 hello world
 2 hello world
 3 hello world
 4 hello world
 5 hello world
 6 hello world
 7 hello world
 
 8 hello world
 9 hello world
10 hello world
11 hello world

示例2：

1 n = 0
2 while True:
3     if n==10:
4         break
5     print n ,‘hello‘
6     n +=1

打印如下：

 1 0 hello
 2 1 hello
 3 2 hello
 4 3 hello
 5 4 hello
 6 5 hello
 7 6 hello
 8 7 hello
 9 8 hello
10 9 hello

示例3：

#條件為假的時候，也是退出循環.輸入空字符的時候也退出循環
 

1 rinput = ‘‘
2 while rinput !=‘q‘:
3     rinput = raw_input(‘please input something,q is quite: ‘)
4     print ‘hello‘
5     if rinput == ‘‘:
6         break

示例4：

#應用邏輯非判斷，退出while循環。while條件為假時，退出while循環

1 rinput = ‘‘
2 while rinput !=‘q‘:
3     rinput = raw_input(‘please input something,q is quite: 
 
‘)
4     print ‘hello‘
5     if not rinput :
6         break

示例5：

# while...else...:正常結束while循環時會打印else後面的語句.與for...else...循環體一樣

1 rinput = ‘‘
2 while rinput !=‘q‘:
3     rinput = raw_input(‘please input something,q is quite: ‘)
4     print ‘hello‘
5     if not rinput :
6         break
7 else:
8     print ‘hello world‘

示例6：

#while 循環嵌套if循環體，支持contine

 1 rinput = ‘‘
 2 while rinput !=‘q‘:
 3     rinput = raw_input(‘please input something,q is quite: ‘)
 4     print ‘hello‘
 5     if not rinput :
 6         break
 7     elif rinput == ‘quite‘:
 8         continue
 9         print ‘continue‘
10 else:
11     print ‘hello world‘

python 基礎 2.4 while 循環