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怎么样使用Python中的身份运算符?

2016-03-20 22:07:08 来源:www.45fan.com 【

怎么样使用Python中的身份运算符?

Python身份运算符
身份运算符用于比较两个对象的存储单元

怎么样使用Python中的身份运算符?

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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Tags: python 讲解 举例
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