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bpo-43926: Cleaner metadata with PEP 566 JSON support. (GH-25565)

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* bpo-43926: Cleaner metadata with PEP 566 JSON support.

* Add blurb

* Add versionchanged and versionadded declarations for changes to metadata.

* Use descriptor for PEP 566
This commit is contained in:
Jason R. Coombs 2021-05-02 17:03:40 -04:00 • committed by GitHub
parent 0ad1e0384c
commit 37e0c7850d
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12 changed files with 254 additions and 26 deletions
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29
Lib/importlib/metadata/_meta.py Normal file
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@ -0,0 +1,29 @@
from typing import Any, Dict, Iterator, List, Protocol, TypeVar, Union
_T = TypeVar("_T")
class PackageMetadata(Protocol):
def __len__(self) -> int:
... # pragma: no cover
def __contains__(self, item: str) -> bool:
... # pragma: no cover
def __getitem__(self, key: str) -> str:
... # pragma: no cover
def __iter__(self) -> Iterator[str]:
... # pragma: no cover
def get_all(self, name: str, failobj: _T = ...) -> Union[List[Any], _T]:
"""
Return all values associated with a possibly multi-valued key.
"""
@property
def json(self) -> Dict[str, Union[str, List[str]]]:
"""
A JSON-compatible form of the metadata.
"""