Making functions/methods subscriptable
Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 25/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- python
- Domain
- developer-experience
Research direction
Start by reading the linked python-ideas discussion, then review PEP 612 and issue #946 to understand the stated limitations. The proposal involves subscriptable FunctionType and related types, descriptor binding, and likely type-checker special cases; done would require an agreed design and corresponding type-checker support.
Written by the indexing model from the issue text.
Description
I'd like to make both instances and the types of functions and methods (including builtin methods) subscriptable.
Part of this proposal has been discussed already on python-ideas (https://discuss.python.org/t/making-functions-subscriptable-at-runtime/26463) but I thought it might also be worthwhile making FunctionType etc. subscriptable and work in a similar way to Callable just with extra descriptor behaviour that binds it into a MethodType.
class Foo:
bar: FunctionType[[Self, int], str]
# equivalent to
def bar(self, arg1, /) -> str: ...
This is different from Callable as if FunctionType was replaced with Callable, bar would always require a self argument.
This unfortunately probably requires special casing in type checkers as it isn't quite currently possible with PEP 612 (ParamSpec + Concatenate) (see #946) unless the PEP is updated
- Dominant language
- Python
- Stars
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- 302
- Avg merge
- 23h
- Merged PRs (30d)
- 8
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