[Python-ideas] Re: PEP 472 - new dunder attribute, to influence item access

[Joseph Martinot-Lagarde]

That's only one of the possible uses, and I'm not even sure that it would be 
implemented directly. Adding keywords to indexation for custom classes is not 
the same as modifying the standard dict type for typing.
Anyway, my point was that it's still possible to do it later without breaking 
anything. Many features were added incrementally, including type hints !
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