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Use protocols for shutils.copyfileobj() (#2291)

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See https://github.com/python/typing/issues/564 for background.
This commit is contained in:
Sebastian Rittau
2018-06-28 19:28:24 +02:00
committed by Jelle Zijlstra
parent 7ebd609643
commit 187aaaced9
1 changed files with 11 additions and 2 deletions
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13
stdlib/2and3/shutil.pyi
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@@ -7,7 +7,7 @@ import sys
from typing import (
List, Iterable, Callable, Any, Tuple, Sequence, NamedTuple, IO,
AnyStr, Optional, Union, Set, TypeVar, overload, Type
AnyStr, Optional, Union, Set, TypeVar, overload, Type, Protocol
)
if sys.version_info >= (3, 6):
@@ -40,7 +40,16 @@ else:
class SpecialFileError(EnvironmentError): ...
class ExecError(EnvironmentError): ...
def copyfileobj(fsrc: IO[AnyStr], fdst: IO[AnyStr],
_S_co = TypeVar("_S_co", covariant=True)
_S_contra = TypeVar("_S_contra", contravariant=True)
class _Reader(Protocol[_S_co]):
def read(self, length: int) -> _S_co: ...
class _Writer(Protocol[_S_contra]):
def write(self, data: _S_contra) -> Any: ...
def copyfileobj(fsrc: _Reader[AnyStr], fdst: _Writer[AnyStr],
length: int = ...) -> None: ...
if sys.version_info >= (3,):