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Python中关键字is与==的区别简述

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Release： 2016-06-16 08:43:00
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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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