Added return type to ImageFile.load()

src/PIL/Image.py

@@ -218,9 +218,10 @@ class Quantize(IntEnum):
 # Registries
 
 if TYPE_CHECKING:
+    import mmap
     from xml.etree.ElementTree import Element
 
-    from . import ImageFile, ImagePalette, TiffImagePlugin
+    from . import ImageFile, ImageFilter, ImagePalette, TiffImagePlugin
     from ._typing import NumpyArray, StrOrBytesPath, TypeGuard
 ID: list[str] = []
 OPEN: dict[
@@ -612,7 +613,7 @@ def close(self) -> None:
                 logger.debug("Error closing: %s", msg)
 
         if getattr(self, "map", None):
-            self.map = None
+            self.map: mmap.mmap | None = None
 
         # Instead of simply setting to None, we're setting up a
         # deferred error that will better explain that the core image
@@ -1336,9 +1337,6 @@ def _expand(self, xmargin: int, ymargin: int | None = None) -> Image:
         self.load()
         return self._new(self.im.expand(xmargin, ymargin))
 
-    if TYPE_CHECKING:
-        from . import ImageFilter
-
     def filter(self, filter: ImageFilter.Filter | type[ImageFilter.Filter]) -> Image:
         """
         Filters this image using the given filter.  For a list of

src/PIL/ImageFile.py

@@ -174,7 +174,7 @@ def verify(self) -> None:
             self.fp.close()
         self.fp = None
 
-    def load(self):
+    def load(self) -> Image.core.PixelAccess | None:
         """Load image data based on tile list"""
 
         if self.tile is None:
@@ -185,25 +185,25 @@ def load(self):
         if not self.tile:
             return pixel
 
-        self.map = None
+        self.map: mmap.mmap | None = None
         use_mmap = self.filename and len(self.tile) == 1
         # As of pypy 2.1.0, memory mapping was failing here.
         use_mmap = use_mmap and not hasattr(sys, "pypy_version_info")
 
         readonly = 0
 
         # look for read/seek overrides
-        try:
+        if hasattr(self, "load_read"):
             read = self.load_read
             # don't use mmap if there are custom read/seek functions
             use_mmap = False
-        except AttributeError:
+        else:
             read = self.fp.read
 
-        try:
+        if hasattr(self, "load_seek"):
             seek = self.load_seek
             use_mmap = False
-        except AttributeError:
+        else:
             seek = self.fp.seek
 
         if use_mmap:
@@ -243,11 +243,8 @@ def load(self):
             # sort tiles in file order
             self.tile.sort(key=_tilesort)
 
-            try:
-                # FIXME: This is a hack to handle TIFF's JpegTables tag.
-                prefix = self.tile_prefix
-            except AttributeError:
-                prefix = b""
+            # FIXME: This is a hack to handle TIFF's JpegTables tag.
+            prefix = getattr(self, "tile_prefix", b"")
 
             # Remove consecutive duplicates that only differ by their offset
             self.tile = [