Python：我如何检查一个对象的类型是datetime.date？ [英] Python: how can I check whether an object is of type datetime.date?

问题描述

我已经尝试了一些明显的选择，但没有一个工作：

I have tried a few obvious options but none of them works:

In [150]: x
Out[150]: datetime.date(2012, 9, 1)

In [151]: type(x)
Out[151]: datetime.date

In [152]: isinstance(x, datetime.date)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-152-9a298ea6fce5> in <module>()
----> 1 isinstance(x, datetime.date)

TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types

In [153]: x is datetime.date
Out[153]: False

In [154]: type(x) is datetime.date
Out[154]: False

这样做的正确方法是什么？

What is the right way of doing this?

推荐答案

我相信在你的例子中不起作用的原因是你已经导入了 datetime ：

i believe the reason it is not working in your example is that you have imported datetime like so :

from datetime import datetime

导致您看到的错误

In [30]: isinstance(x, datetime.date)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/<ipython-input-30-9a298ea6fce5> in <module>()
----> 1 isinstance(x, datetime.date)

TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types

如果您只是简单地导入：

if you simply import like so :

import datetime

代码将按照所有其他答案所示运行

the code will run as shown in all of the other answers

In [31]: import datetime

In [32]: isinstance(x, datetime.date)
Out[32]: True

In [33]: 

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