讲解Python中的标识运算符

 更新时间:2015年05月14日 10:12:08   投稿:goldensun   我要评论
这篇文章主要介绍了讲解Python中的标识运算符,是Python学习当中的基础知识,需要的朋友可以参考下

 下表列出了所有Python语言支持的标识运算符。

2015514101018679.jpg (589×219)

示例:

试试下面的例子就明白了所有Python编程语言提供的标识运算符:

#!/usr/bin/python
a = 20
b = 20
if ( a is b ):
  print "Line 1 - a and b have same identity"
else:
  print "Line 1 - a and b do not have same identity"
if ( id(a) == id(b) ):
  print "Line 2 - a and b have same identity"
else:
  print "Line 2 - a and b do not have same identity"
b = 30
if ( a is b ):
  print "Line 3 - a and b have same identity"
else:
  print "Line 3 - a and b do not have same identity"
if ( a is not b ):
  print "Line 4 - a and b do not have same identity"
else:
  print "Line 4 - a and b have same identity"

当执行上面的程序它会产生以下结果:

Line 1 - a and b have same identity
Line 2 - a and b have same identity
Line 3 - a and b do not have same identity
Line 4 - a and b do not have same identity


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