24 lines
956 B
Python
24 lines
956 B
Python
from collections.abc import Callable, Mapping
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from typing import TypeVar
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# Apparently you need Python 3.13 for type var defaults to work. But since this
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# is just a stub file, it's okay if they aren't supported at runtime.
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KIn = TypeVar("KIn")
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KOut = TypeVar("KOut", default=KIn)
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VIn = TypeVar("VIn")
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VOut = TypeVar("VOut", default=VIn)
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type Path[KIn] = tuple[KIn, ...]
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# remap() is Complicated and really difficult to define a type for, so I'm not
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# surprised the boltons package doesn't try to type it for you. This particular
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# type declaration works fine for my use of the function, but it's actually
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# vastly more flexible than that - it'll accept any iterable as the root, not
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# just mappings, and you can provide "enter" and "exit" callables to support
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# arbitrary data structures.
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def remap(
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root: Mapping[KIn, VIn],
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visit: Callable[[Path[KIn], KIn, VIn], tuple[KOut, VOut] | bool],
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reraise_visit: bool = False,
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) -> Mapping[KOut, VOut]: ...
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