讲解Python中的标识运算符

 下表列出了所有python语言支持的标识运算符。

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