python 基礎 2.4 while 迴圈

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

樣本1：

1 n = 02 while True:3     print ‘hello world‘4     if n == 10:5         break6     n +=1

列印如下：

 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 world10 hello world11 hello world

樣本2：

1 n = 02 while True:3     if n==10:4         break5     print n ,‘hello‘6     n +=1

列印如下：

 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 hello10 9 hello

樣本3：

#條件為假的時候，也是退出迴圈.輸入Null 字元的時候也退出迴圈

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

樣本4：

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

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

 

樣本5：

# while...else...:正常結束while迴圈時會列印else後面的語句.與for...else...迴圈體一樣

1 rinput = ‘‘2 while rinput !=‘q‘:3     rinput = raw_input(‘please input something,q is quite: ‘)4     print ‘hello‘5     if not rinput :6         break7 else:8     print ‘hello world‘

 

樣本6：

#while 迴圈嵌套if迴圈體，支援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 迴圈