Python中关键字is与==的区别简述
本文以简单示例分析了python中关键字is与 ==的区别,供大家参考一下。
首先说明一下Python学习中几个相关的小知识点。
Python中的对象包含三要素:id、type、value
其中:id用来唯一标识一个对象,type标识对象的类型,value是对象的值
is判断的是a对象是否就是b对象,是通过id来判断的
==判断的是a对象的值是否和b对象的值相等,是通过value来判断的
具体示例如下:
>>> a=100 >>> b=100.0 >>> a is b False >>> a==b True >>> id(a) 30696848L >>> id(b) 48685000L >>> id(a)==id(b) False

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