Dealing with non-callable classmethod objects

[Dieter Maurer]

Ian Pilcher wrote at 2022-11-11 15:29 -0600:
> ...
>In searching, I've found a few articles that discuss the fact that
>classmethod objects aren't callable, but the situation actually seems to
>be more complicated.
>
> >>> type(DuidLLT._parse_l2addr)
><class 'method'>
> >>> callable(DuidLLT._parse_l2addr)
>True
>
>The method itself is callable, which makes sense.  The factory function
>doesn't access it directly, however, it gets it out of the _attrs
>dictionary.
>
> >>> type(DuidLLT._attrs['layer2_addr'])
><class 'classmethod'>
> >>> callable(DuidLLT._attrs['layer2_addr'])
>False

Accessing an object via a `dict` does not change its type,
nor does putting it into a `dict`.
Thus, you did not put `DuidLLT._parse_l2addr` (of type `method`)
into your `_attrs` `dict` but something else (of type `classmethod`).

This narrows down the space for your investigation: why was
the object you have put into `_attr` was not what you have expected.