remove redundant methods from _io classes (#12761)

Author: tungol

stdlib/_io.pyi

@@ -73,33 +73,28 @@ class FileIO(RawIOBase, _RawIOBase, BinaryIO):  # type: ignore[misc]  # incompat
     ) -> None: ...
     @property
     def closefd(self) -> bool: ...
-    def __enter__(self) -> Self: ...
 
 class BytesIO(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
     def __init__(self, initial_bytes: ReadableBuffer = ...) -> None: ...
     # BytesIO does not contain a "name" field. This workaround is necessary
     # to allow BytesIO sub-classes to add this field, as it is defined
     # as a read-only property on IO[].
     name: Any
-    def __enter__(self) -> Self: ...
     def getvalue(self) -> bytes: ...
     def getbuffer(self) -> memoryview: ...
     def read1(self, size: int | None = -1, /) -> bytes: ...
 
 class BufferedReader(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
     raw: RawIOBase
-    def __enter__(self) -> Self: ...
     def __init__(self, raw: RawIOBase, buffer_size: int = ...) -> None: ...
     def peek(self, size: int = 0, /) -> bytes: ...
 
 class BufferedWriter(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of writelines in the base classes
     raw: RawIOBase
-    def __enter__(self) -> Self: ...
     def __init__(self, raw: RawIOBase, buffer_size: int = ...) -> None: ...
     def write(self, buffer: ReadableBuffer, /) -> int: ...
 
 class BufferedRandom(BufferedReader, BufferedWriter, BufferedIOBase, _BufferedIOBase):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
-    def __enter__(self) -> Self: ...
     def seek(self, target: int, whence: int = 0, /) -> int: ...  # stubtest needs this
 
 class BufferedRWPair(BufferedIOBase, _BufferedIOBase):
@@ -159,8 +154,6 @@ class TextIOWrapper(TextIOBase, _TextIOBase, TextIO, Generic[_BufferT_co]):  # t
     @property
     def buffer(self) -> _BufferT_co: ...  # type: ignore[override]
     @property
-    def closed(self) -> bool: ...
-    @property
     def line_buffering(self) -> bool: ...
     @property
     def write_through(self) -> bool: ...
@@ -173,13 +166,7 @@ class TextIOWrapper(TextIOBase, _TextIOBase, TextIO, Generic[_BufferT_co]):  # t
         line_buffering: bool | None = None,
         write_through: bool | None = None,
     ) -> None: ...
-    # These are inherited from TextIOBase, but must exist in the stub to satisfy mypy.
-    def __enter__(self) -> Self: ...
-    def __iter__(self) -> Iterator[str]: ...  # type: ignore[override]
-    def __next__(self) -> str: ...  # type: ignore[override]
-    def writelines(self, lines: Iterable[str], /) -> None: ...  # type: ignore[override]
     def readline(self, size: int = -1, /) -> str: ...  # type: ignore[override]
-    def readlines(self, hint: int = -1, /) -> list[str]: ...  # type: ignore[override]
     # Equals the "buffer" argument passed in to the constructor.
     def detach(self) -> _BufferT_co: ...  # type: ignore[override]
     # TextIOWrapper's version of seek only supports a limited subset of