Removed mypy excludes, except for olefile-related files

.coveragerc

@@ -10,6 +10,8 @@ exclude_also =
     if DEBUG:
     # Don't complain about compatibility code for missing optional dependencies
     except ImportError
+    if TYPE_CHECKING:
+    @abc.abstractmethod
 
 [run]
 omit =

pyproject.toml

@@ -141,16 +141,6 @@ warn_redundant_casts = true
 warn_unreachable = true
 warn_unused_ignores = true
 exclude = [
-  '^src/PIL/_tkinter_finder.py$',
-  '^src/PIL/DdsImagePlugin.py$',
   '^src/PIL/FpxImagePlugin.py$',
-  '^src/PIL/Image.py$',
-  '^src/PIL/ImageQt.py$',
-  '^src/PIL/ImImagePlugin.py$',
   '^src/PIL/MicImagePlugin.py$',
-  '^src/PIL/PdfParser.py$',
-  '^src/PIL/PyAccess.py$',
-  '^src/PIL/TiffImagePlugin.py$',
-  '^src/PIL/TiffTags.py$',
-  '^src/PIL/WebPImagePlugin.py$',
 ]

src/PIL/DdsImagePlugin.py

@@ -270,13 +270,17 @@ class D3DFMT(IntEnum):
 # Backward compatibility layer
 module = sys.modules[__name__]
 for item in DDSD:
+    assert item.name is not None
     setattr(module, "DDSD_" + item.name, item.value)
-for item in DDSCAPS:
-    setattr(module, "DDSCAPS_" + item.name, item.value)
-for item in DDSCAPS2:
-    setattr(module, "DDSCAPS2_" + item.name, item.value)
-for item in DDPF:
-    setattr(module, "DDPF_" + item.name, item.value)
+for item1 in DDSCAPS:
+    assert item1.name is not None
+    setattr(module, "DDSCAPS_" + item1.name, item1.value)
+for item2 in DDSCAPS2:
+    assert item2.name is not None
+    setattr(module, "DDSCAPS2_" + item2.name, item2.value)
+for item3 in DDPF:
+    assert item3.name is not None
+    setattr(module, "DDPF_" + item3.name, item3.value)
 
 DDS_FOURCC = DDPF.FOURCC
 DDS_RGB = DDPF.RGB

src/PIL/ImImagePlugin.py

@@ -93,8 +93,8 @@
 for i in ["32S"]:
     OPEN[f"L {i} image"] = ("I", f"I;{i}")
     OPEN[f"L*{i} image"] = ("I", f"I;{i}")
-for i in range(2, 33):
-    OPEN[f"L*{i} image"] = ("F", f"F;{i}")
+for j in range(2, 33):
+    OPEN[f"L*{j} image"] = ("F", f"F;{j}")
 
 
 # --------------------------------------------------------------------

src/PIL/Image.py

@@ -26,6 +26,7 @@
 
 from __future__ import annotations
 
+import abc
 import atexit
 import builtins
 import io
@@ -40,11 +41,8 @@
 from collections.abc import Callable, MutableMapping
 from enum import IntEnum
 from pathlib import Path
-
-try:
-    from defusedxml import ElementTree
-except ImportError:
-    ElementTree = None
+from types import ModuleType
+from typing import IO, TYPE_CHECKING, Any
 
 # VERSION was removed in Pillow 6.0.0.
 # PILLOW_VERSION was removed in Pillow 9.0.0.
@@ -60,6 +58,12 @@
 from ._binary import i32le, o32be, o32le
 from ._util import DeferredError, is_path
 
+ElementTree: ModuleType | None
+try:
+    from defusedxml import ElementTree
+except ImportError:
+    ElementTree = None
+
 logger = logging.getLogger(__name__)
 
 
@@ -110,6 +114,7 @@ class DecompressionBombError(Exception):
 
 
 USE_CFFI_ACCESS = False
+cffi: ModuleType | None
 try:
     import cffi
 except ImportError:
@@ -211,14 +216,22 @@ class Quantize(IntEnum):
 # --------------------------------------------------------------------
 # Registries
 
-ID = []
-OPEN = {}
-MIME = {}
-SAVE = {}
-SAVE_ALL = {}
-EXTENSION = {}
-DECODERS = {}
-ENCODERS = {}
+if TYPE_CHECKING:
+    from . import ImageFile
+ID: list[str] = []
+OPEN: dict[
+    str,
+    tuple[
+        Callable[[IO[bytes], str | bytes], ImageFile.ImageFile],
+        Callable[[bytes], bool] | None,
+    ],
+] = {}
+MIME: dict[str, str] = {}
+SAVE: dict[str, Callable[[Image, IO[bytes], str | bytes], None]] = {}
+SAVE_ALL: dict[str, Callable[[Image, IO[bytes], str | bytes], None]] = {}
+EXTENSION: dict[str, str] = {}
+DECODERS: dict[str, object] = {}
+ENCODERS: dict[str, object] = {}
 
 # --------------------------------------------------------------------
 # Modes
@@ -2383,12 +2396,12 @@ def save(self, fp, format=None, **params) -> None:
            may have been created, and may contain partial data.
         """
 
-        filename = ""
+        filename: str | bytes = ""
         open_fp = False
         if isinstance(fp, Path):
             filename = str(fp)
             open_fp = True
-        elif is_path(fp):
+        elif isinstance(fp, (str, bytes)):
             filename = fp
             open_fp = True
         elif fp == sys.stdout:
@@ -2398,7 +2411,7 @@ def save(self, fp, format=None, **params) -> None:
                 pass
         if not filename and hasattr(fp, "name") and is_path(fp.name):
             # only set the name for metadata purposes
-            filename = fp.name
+            filename = os.path.realpath(os.fspath(fp.name))
 
         # may mutate self!
         self._ensure_mutable()
@@ -2409,7 +2422,8 @@ def save(self, fp, format=None, **params) -> None:
 
         preinit()
 
-        ext = os.path.splitext(filename)[1].lower()
+        filename_ext = os.path.splitext(filename)[1].lower()
+        ext = filename_ext.decode() if isinstance(filename_ext, bytes) else filename_ext
 
         if not format:
             if ext not in EXTENSION:
@@ -2451,7 +2465,7 @@ def save(self, fp, format=None, **params) -> None:
         if open_fp:
             fp.close()
 
-    def seek(self, frame) -> Image:
+    def seek(self, frame) -> None:
         """
         Seeks to the given frame in this sequence file. If you seek
         beyond the end of the sequence, the method raises an
@@ -2511,10 +2525,8 @@ def split(self) -> tuple[Image, ...]:
 
         self.load()
         if self.im.bands == 1:
-            ims = [self.copy()]
-        else:
-            ims = map(self._new, self.im.split())
-        return tuple(ims)
+            return (self.copy(),)
+        return tuple(map(self._new, self.im.split()))
 
     def getchannel(self, channel):
         """
@@ -2871,7 +2883,14 @@ class ImageTransformHandler:
     (for use with :py:meth:`~PIL.Image.Image.transform`)
     """
 
-    pass
+    @abc.abstractmethod
+    def transform(
+        self,
+        size: tuple[int, int],
+        image: Image,
+        **options: dict[str, str | int | tuple[int, ...] | list[int]],
+    ) -> Image:
+        pass
 
 
 # --------------------------------------------------------------------
@@ -3243,11 +3262,9 @@ def open(fp, mode="r", formats=None) -> Image:
         raise TypeError(msg)
 
     exclusive_fp = False
-    filename = ""
-    if isinstance(fp, Path):
-        filename = str(fp.resolve())
-    elif is_path(fp):
-        filename = fp
+    filename: str | bytes = ""
+    if is_path(fp):
+        filename = os.path.realpath(os.fspath(fp))
 
     if filename:
         fp = builtins.open(filename, "rb")
@@ -3421,7 +3438,11 @@ def merge(mode, bands):
 # Plugin registry
 
 
-def register_open(id, factory, accept=None) -> None:
+def register_open(
+    id,
+    factory: Callable[[IO[bytes], str | bytes], ImageFile.ImageFile],
+    accept: Callable[[bytes], bool] | None = None,
+) -> None:
     """
     Register an image file plugin.  This function should not be used
     in application code.
@@ -3631,7 +3652,13 @@ def _apply_env_variables(env=None):
 atexit.register(core.clear_cache)
 
 
-class Exif(MutableMapping):
+if TYPE_CHECKING:
+    _ExifBase = MutableMapping[int, Any]
+else:
+    _ExifBase = MutableMapping
+
+
+class Exif(_ExifBase):
     """
     This class provides read and write access to EXIF image data::
 

src/PIL/ImageQt.py

@@ -19,19 +19,26 @@
 
 import sys
 from io import BytesIO
+from typing import Callable
 
 from . import Image
 from ._util import is_path
 
+qt_version: str | None
 qt_versions = [
     ["6", "PyQt6"],
     ["side6", "PySide6"],
 ]
 
 # If a version has already been imported, attempt it first
-qt_versions.sort(key=lambda qt_version: qt_version[1] in sys.modules, reverse=True)
-for qt_version, qt_module in qt_versions:
+qt_versions.sort(key=lambda version: version[1] in sys.modules, reverse=True)
+for version, qt_module in qt_versions:
     try:
+        QBuffer: type
+        QIODevice: type
+        QImage: type
+        QPixmap: type
+        qRgba: Callable[[int, int, int, int], int]
         if qt_module == "PyQt6":
             from PyQt6.QtCore import QBuffer, QIODevice
             from PyQt6.QtGui import QImage, QPixmap, qRgba
@@ -41,6 +48,7 @@
     except (ImportError, RuntimeError):
         continue
     qt_is_installed = True
+    qt_version = version
     break
 else:
     qt_is_installed = False

src/PIL/ImageShow.py

@@ -184,7 +184,7 @@ class UnixViewer(Viewer):
 
     @abc.abstractmethod
     def get_command_ex(self, file: str, **options: Any) -> tuple[str, str]:
-        pass  # pragma: no cover
+        pass
 
     def get_command(self, file: str, **options: Any) -> str:
         command = self.get_command_ex(file, **options)[0]

src/PIL/PdfParser.py

@@ -8,6 +8,7 @@
 import re
 import time
 import zlib
+from typing import TYPE_CHECKING, Any, List, Union
 
 
 # see 7.9.2.2 Text String Type on page 86 and D.3 PDFDocEncoding Character Set
@@ -239,12 +240,18 @@ def __bytes__(self):
         return bytes(result)
 
 
-class PdfArray(list):
+class PdfArray(List[Any]):
     def __bytes__(self):
         return b"[ " + b" ".join(pdf_repr(x) for x in self) + b" ]"
 
 
-class PdfDict(collections.UserDict):
+if TYPE_CHECKING:
+    _DictBase = collections.UserDict[Union[str, bytes], Any]
+else:
+    _DictBase = collections.UserDict
+
+
+class PdfDict(_DictBase):
     def __setattr__(self, key, value):
         if key == "data":
             collections.UserDict.__setattr__(self, key, value)

src/PIL/PyAccess.py

@@ -25,6 +25,7 @@
 
 from ._deprecate import deprecate
 
+FFI: type
 try:
     from cffi import FFI