python中冒号作用 python冒号的用法

注意if\while\for等(或函数定义)语句在结尾处包含一个冒号——我们通过它告诉 python下面跟着一个语句块。

--------------冒号的用法

if guess == number: 

 print 'Congratulations, you guessed it.' # New block starts here 

 print "(but you do not win any prizes!)" # New block ends here 

 elif guess < color="#ff0000">: 

 print 'No, it is a little higher than that' # Another block 

 # You can do whatever you want in a block ... 

 else: 

 print 'No, it is a little lower than that' 

 -------------- 

 def printMax(x, y): 

 '''输出最大的2个数. 

 2个数值必需是整数.''' 

 x = int(x) # convert to integers, 

 if possible 

 y = int(y) 

 if x > y: 

 print x, 'is maximum' 

 else: 

 print y, 'is maximum' 

 ========逗号的特殊用途 

 for item in shoplist: 

 print item,

我们在print语句的结尾使用了一个 逗号 来消除每个print语句自动打印的换行符。这样做有点难看，不过确实简单有效。