Double equals vs 在 python 中

我在 Python 解释器中运行以下代码:

>>> foo = 10
>>> dir(foo) == dir(10)
True
>>> dir(foo) is dir(10)
False
>>>

为什么会这样？

python
comparison
boolean
equals
equality

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最佳答案

is checks that 2 arguments refer to the same object, == checks that 2 arguments have the same value. dir() returns a list which contains the same data for both foo and 10, but the actual list instances for the 2 things are different.