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举例讲解Python中的身份运算符的使用方法

时间：2022-07-26 00:00 编辑：来源：阅读：
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摘要：举例讲解Python中的身份运算符的使用方法

[b]Python身份运算符[/b] 身份运算符用于比较两个对象的存储单元 [img]http://files.jb51.net/file_images/article/201510/20151013154525044.jpg?2015913154535[/img] 以下实例演示了Python所有身份运算符的操作：

#!/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"

以上实例输出结果：

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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