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gh-108411: Make typing.IO/BinaryIO arguments positional-only #142906

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gh-108411: Make typing.IO/BinaryIO arguments positional-only #142906

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18 changes: 9 additions & 9 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3524,23 +3524,23 @@ def isatty(self) -> bool:
pass

@abstractmethod
def read(self, n: int = -1) -> AnyStr:
def read(self, n: int = -1, /) -> AnyStr:
pass

@abstractmethod
def readable(self) -> bool:
pass

@abstractmethod
def readline(self, limit: int = -1) -> AnyStr:
def readline(self, limit: int = -1, /) -> AnyStr:
pass

@abstractmethod
def readlines(self, hint: int = -1) -> list[AnyStr]:
def readlines(self, hint: int = -1, /) -> list[AnyStr]:
pass

@abstractmethod
def seek(self, offset: int, whence: int = 0) -> int:
def seek(self, offset: int, whence: int = 0, /) -> int:
pass

@abstractmethod
Expand All @@ -3552,27 +3552,27 @@ def tell(self) -> int:
pass

@abstractmethod
def truncate(self, size: int | None = None) -> int:
def truncate(self, size: int | None = None, /) -> int:
pass

@abstractmethod
def writable(self) -> bool:
pass

@abstractmethod
def write(self, s: AnyStr) -> int:
def write(self, s: AnyStr, /) -> int:
pass

@abstractmethod
def writelines(self, lines: list[AnyStr]) -> None:
def writelines(self, lines: list[AnyStr], /) -> None:
pass

@abstractmethod
def __enter__(self) -> IO[AnyStr]:
pass

@abstractmethod
def __exit__(self, type, value, traceback) -> None:
def __exit__(self, type, value, traceback, /) -> None:
pass


Expand All @@ -3582,7 +3582,7 @@ class BinaryIO(IO[bytes]):
__slots__ = ()

@abstractmethod
def write(self, s: bytes | bytearray) -> int:
def write(self, s: bytes | bytearray, /) -> int:
pass

@abstractmethod
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-17-02-55-03.gh-issue-108411.up7MAc.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
``typing.IO`` and ``typing.BinaryIO`` method arguments are now
positional-only.
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