Does Python itself break inheritance foundations with Hashable class?

Asked Jul 08 '20 at 10:29

Active Jul 08 '20 at 10:29

Viewed 27 times

from collections import Hashable

issubclass(list, object)      # True
issubclass(object, Hashable)  # True
issubclass(list, Hashable)    # False

I thought that inheritance was a transitive relationship. So if "A inherits from B" and "B inherits from C" then "A inherits from C".

How come lists are not hashable considering that objects carry hash among their attribute?

asked Jul 08 '20 at 10:29

1

`Hashable` isn't a true class, actually. In the sense that neither `object` or `list` actually inherit from `Hashable` – juanpa.arrivillaga Jul 08 '20 at 10:32
so, reading the original [PEP](https://www.python.org/dev/peps/pep-3119/) that introduced abc's is informative – juanpa.arrivillaga Jul 08 '20 at 10:47

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