如何测试一个对象是否是另一个对象？ [英] How to test if an object IS another object?

问题描述

如果两个对象具有相同的值，则可以将它们与==进行比较。我想要做的就是找出两个对象实际上只是对同一个对象的引用，我怎么能用Python做到这一点？


谢谢

If two objects are of equal value you can compare them with ==. What I
want to do is find out if two objects are actually just references to
the same object, how can I do this in Python?

Thanks

推荐答案

da ******* @ gmail.com écrit：

如果两个对象具有相同的值，您可以将它们与==进行比较。我想要做的是找出两个对象实际上是否只是对同一个对象的引用，我该如何在Python中执行此操作？

If two objects are of equal value you can compare them with ==. What I
want to do is find out if two objects are actually just references to
the same object, how can I do this in Python?

最明显的方式（像往常一样？）：


如果obj1是obj2：

//你的代码在这里

The most obvious way (as usual ?):

if obj1 is obj2:
// your code here

对于删除我的消息感到抱歉，我发布了错误的谷歌

帐户，我真的不希望我的电子邮件在那些恼人的垃圾邮件机器人

可以找到它。

Sorry about removing my message, I posted with the wrong google
account, I don''t really want my email where those irritating spam bots
can find it.

最明显的方式（像往常一样？）：

如果obj1是obj2：
//你的代码在这里


我马上就想到了，并在控制台上对它进行了测试，但它没有像我预期的那样工作：

foo = 3
bar = 3
zoo = foo
foo是动物园
Truefoo是酒吧
Truezoo是酒吧

The most obvious way (as usual ?):

if obj1 is obj2:
// your code here
I immediately thought of is, and tested it in the console, but it
didn''t work quite like I expected:
foo = 3
bar = 3
zoo = foo
foo is zoo Truefoo is bar Truezoo is bar

True


很明显foo和bar有相同的价值，但它们是不同的对象

不是吗？然而应用is运算符产生True。


谢谢，

-Dan

True

clearly foo and bar have the same value but they are different objects
aren''t they? Yet applying the is operator yields True.

Thanks,
-Dan

el******@yahoo.com 写道：

foo = 3
bar = 3

foo = 3
bar = 3

很明显foo和bar有相同的值，但它们是不同的对象
不是吗？

clearly foo and bar have the same value but they are different objects
aren''t they?

不，他们是同一个对象。现在尝试使用300而不是3 ;-)。

No, they''re the same object. Now try it with 300 instead of 3 ;-).

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