On 2021-06-21 9:39 p.m., Steven D'Aprano wrote:
>
> Fourth step is that you go ahead and use lists as normal. Whether you
> use getattr or dot syntax, any extension methods defined in spam.py will
> show up, as if they were actual list methods.
>
> hasattr([], 'head') # returns True
> list.tail # returns the spam.tail function object (unbound method)
>
> They're not monkey-patched: other modules don't see that.
>
>
Python is a dynamic language. Maybe you're using hasattr/getattr to
forward something from A to B. If "other modules don't see that" then
this must work as if there were no extension methods in place. So you
actually wouldn't want the local load_attr override to apply to those.
If you did... well, just call the override directly. If the override was
called __opcode_load_attr_impl__ you'd just call
__opcode_load_attr_impl__ directly instead of going through getattr.
There needs to be an escape hatch for this.
Or you *could* have getattr be special (called by load_attr) and
overridable, and builtins.getattr be the escape hatch, but nobody would
like that.
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