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