Python的循环机制

  For

For 循环相信大家都很熟悉吧，在别的语言里面也经常用的到，而在Python中的用法其实在上一个章节中其实已经涉及到了，这篇文章再继续讲解这个用法，而在其他代码中经常用到的for(i=0;i<10;i++)在Python中使用却是如此简单，废话少说，从代码中去体会用法才是王道。

__author__="Alex" __date__ ="$2011-2-17 10:39:27$" if __name__ == "__main__": print "Hello"; # declare a list names = ['Lu', 'Zhang', 'Xu'] # print title before each name for name in names: print( 'Mr. ' + name ) for i in range(1,3): print(i) for i in { '9.2':5, 'wife':'Viki' }: print( i ) # prints out consecutively: 9.2, wife d = { '9.2':5, 'wife':'Viki' } for i in d: print( d[i] ) # prints out consecutively: 5, Viki 

控制台输出：

Hello Mr. Lu Mr. Zhang Mr. Xu 1 2 9.2 wife 5 Viki  

 

While

While循环在Python中的用法也很Easy，至此为止，我发现Python真的如官网上所说，简单高效清晰

__author__="Alex" __date__ ="$2011-2-17 10:39:27$" if __name__ == "__main__": print "Hello"; # set the size of a normal drinking glass to standard 0.2 litres glass_size = 0.2 glasses = int( input('How many glasses (0.2 litres) of water have you drunk today? ') ) # loop until user has drunk 2 litres while glasses * glass_size < 2: glasses = int( input('How many glasses have you drunk now? ') ) print ( "That's at least 2 litres." ) 

Console OutPut：

Hello How many glasses (0.2 litres) of water have you drunk today? 3 How many glasses have you drunk now? 5 How many glasses have you drunk now? 10 That's at least 2 litres.