[Python-ideas] Add __parent__ to all classes, functions, and modules

[Neil Girdhar]

On Sun, Oct 5, 2014 at 2:09 PM, Benjamin Peterson <benjamin at python.org>
wrote:

> Neil Girdhar <mistersheik at ...> writes:
>
> >
> > Many classes, functions, and modules are defined within the context of
> another class, function, or module thereby forming a mathematical forest of
> declarations.  It is possible to walk the descendants using __dict__ (for
> classes and modules), but not the ancestors.  I propose adding __parent__
> that would be filled at the same time that __qualname__ is filled in.
>
> This is unlikely to work.
>
> 1) It turns basically everything into a cycle.
>

Why a cycle?

2) __qualname__ is determined strictly from syntax, whereas __parent__ could
> not be. For example, what happens if I take a method from one class and set
> it on another? __parent__ would not be well-defined.
>

I'm suggesting that parent be determined purely from declaration.  If you
copy something, neither qualname nor parent would change unless you change
them.


> Regards,
> Benjamin
>
>
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