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Use a TypeVar for the return types of TarFile classmethods. #5602

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Jun 12, 2021
Merged

Use a TypeVar for the return types of TarFile classmethods. #5602

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20380e8
Use a TypeVar for the return types of TarFile classmethods.
domdfcoding Jun 9, 2021
62b69aa
Add TypeVar annotation to TarFile.__enter__
domdfcoding Jun 9, 2021
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32 changes: 17 additions & 15 deletions stdlib/tarfile.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,11 @@ from _typeshed import StrOrBytesPath, StrPath
from collections.abc import Callable, Iterable, Iterator, Mapping
from gzip import _ReadableFileobj as _GzipReadableFileobj, _WritableFileobj as _GzipWritableFileobj
from types import TracebackType
from typing import IO, Dict, List, Optional, Protocol, Set, Tuple, Type, Union, overload
from typing import IO, Dict, List, Optional, Protocol, Set, Tuple, Type, TypeVar, Union, overload
from typing_extensions import Literal

_TF = TypeVar("_TF", bound=TarFile)

class _Fileobj(Protocol):
def read(self, __size: int) -> bytes: ...
def write(self, __b: bytes) -> object: ...
Expand Down Expand Up @@ -129,7 +131,7 @@ class TarFile:
def __iter__(self) -> Iterator[TarInfo]: ...
@classmethod
def open(
cls,
cls: Type[_TF],
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Nit: type[_TF]

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mypy doesn't like type[_TF] because of python/mypy#10303

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Sorry about that. I actually tested it before this comment, but it seems that it worked in my small test for some reason, but not here. 😕

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I have switched back to Type[_TF] for now.

name: Optional[StrOrBytesPath] = ...,
mode: str = ...,
fileobj: Optional[IO[bytes]] = ..., # depends on mode
Expand All @@ -144,10 +146,10 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@classmethod
def taropen(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["r", "a", "w", "x"] = ...,
fileobj: Optional[_Fileobj] = ...,
Expand All @@ -161,11 +163,11 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@overload
@classmethod
def gzopen(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["r"] = ...,
fileobj: Optional[_GzipReadableFileobj] = ...,
Expand All @@ -179,11 +181,11 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@overload
@classmethod
def gzopen(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["w", "x"],
fileobj: Optional[_GzipWritableFileobj] = ...,
Expand All @@ -197,11 +199,11 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@overload
@classmethod
def bz2open(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["w", "x"],
fileobj: Optional[_Bz2WritableFileobj] = ...,
Expand All @@ -215,11 +217,11 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@overload
@classmethod
def bz2open(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["r"] = ...,
fileobj: Optional[_Bz2ReadableFileobj] = ...,
Expand All @@ -233,10 +235,10 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
@classmethod
def xzopen(
cls,
cls: Type[_TF],
name: Optional[StrOrBytesPath],
mode: Literal["r", "w", "x"] = ...,
fileobj: Optional[IO[bytes]] = ...,
Expand All @@ -250,7 +252,7 @@ class TarFile:
pax_headers: Optional[Mapping[str, str]] = ...,
debug: Optional[int] = ...,
errorlevel: Optional[int] = ...,
) -> TarFile: ...
) -> _TF: ...
def getmember(self, name: str) -> TarInfo: ...
def getmembers(self) -> List[TarInfo]: ...
def getnames(self) -> List[str]: ...
Expand Down