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举例讲解Python中的身份运算符的使用方法

2020-07-31 11:45anquye200 Python

这篇文章主要介绍了举例讲解Python中的身份运算符的使用方法,是Python入门学习中的基础知识,需要的朋友可以参考下

Python身份运算符
身份运算符用于比较两个对象的存储单元

举例讲解Python中的身份运算符的使用方法

以下实例演示了Python所有身份运算符的操作:

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#!/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:
 

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1
2
3
4
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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