Use IO[bytes] in type hints

src/PIL/ImageFile.py

@@ -32,7 +32,7 @@
 import itertools
 import struct
 import sys
-from typing import Any, NamedTuple
+from typing import IO, Any, NamedTuple
 
 from . import Image
 from ._deprecate import deprecate
@@ -616,7 +616,7 @@ def extents(self):
 
 
 class PyCodec:
-    fd: io.BytesIO | None
+    fd: IO[bytes] | None
 
     def __init__(self, mode, *args):
         self.im = None

src/PIL/MspImagePlugin.py

@@ -26,6 +26,7 @@
 
 import io
 import struct
+from typing import IO
 
 from . import Image, ImageFile
 from ._binary import i16le as i16
@@ -163,7 +164,7 @@ def decode(self, buffer: bytes) -> tuple[int, int]:
 # write MSP files (uncompressed only)
 
 
-def _save(im: Image.Image, fp: io.BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     if im.mode != "1":
         msg = f"cannot write mode {im.mode} as MSP"
         raise OSError(msg)

src/PIL/PcxImagePlugin.py

@@ -28,6 +28,7 @@
 
 import io
 import logging
+from typing import IO
 
 from . import Image, ImageFile, ImagePalette
 from ._binary import i16le as i16
@@ -143,7 +144,7 @@ def _open(self) -> None:
 }
 
 
-def _save(im: Image.Image, fp: io.BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     try:
         version, bits, planes, rawmode = SAVE[im.mode]
     except KeyError as e:

src/PIL/PpmImagePlugin.py

@@ -16,7 +16,7 @@
 from __future__ import annotations
 
 import math
-from io import BytesIO
+from typing import IO
 
 from . import Image, ImageFile
 from ._binary import i16be as i16
@@ -324,7 +324,7 @@ def decode(self, buffer: bytes) -> tuple[int, int]:
 # --------------------------------------------------------------------
 
 
-def _save(im: Image.Image, fp: BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     if im.mode == "1":
         rawmode, head = "1;I", b"P4"
     elif im.mode == "L":

src/PIL/SgiImagePlugin.py

@@ -24,7 +24,7 @@
 
 import os
 import struct
-from io import BytesIO
+from typing import IO
 
 from . import Image, ImageFile
 from ._binary import i16be as i16
@@ -125,7 +125,7 @@ def _open(self) -> None:
             ]
 
 
-def _save(im: Image.Image, fp: BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     if im.mode not in {"RGB", "RGBA", "L"}:
         msg = "Unsupported SGI image mode"
         raise ValueError(msg)

src/PIL/TgaImagePlugin.py

@@ -18,7 +18,7 @@
 from __future__ import annotations
 
 import warnings
-from io import BytesIO
+from typing import IO
 
 from . import Image, ImageFile, ImagePalette
 from ._binary import i16le as i16
@@ -175,7 +175,7 @@ def load_end(self) -> None:
 }
 
 
-def _save(im: Image.Image, fp: BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     try:
         rawmode, bits, colormaptype, imagetype = SAVE[im.mode]
     except KeyError as e:

src/PIL/XbmImagePlugin.py

@@ -21,7 +21,7 @@
 from __future__ import annotations
 
 import re
-from io import BytesIO
+from typing import IO
 
 from . import Image, ImageFile
 
@@ -70,7 +70,7 @@ def _open(self) -> None:
         self.tile = [("xbm", (0, 0) + self.size, m.end(), None)]
 
 
-def _save(im: Image.Image, fp: BytesIO, filename: str) -> None:
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     if im.mode != "1":
         msg = f"cannot write mode {im.mode} as XBM"
         raise OSError(msg)