datetime gotcha

[Skip Montanaro]

> Why is a dtm instance also an instance of dt?

The datetime type is, in fact, a subclass of the date type:

>>> import datetime
>>> datetime.date.__bases__
(<class 'object'>,)
>>> datetime.datetime.__bases__
(<class 'datetime.date'>,)
>>> datetime.time.__bases__
(<class 'object'>,)

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