讲解Python中的标识运算符

下表列出了所有python/' target='_blank'>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/pythona = 20b = 20if ( 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 = 30if ( 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 identityLine 2 - a and b have same identityLine 3 - a and b do not have same identityLine 4 - a and b do not have same identity