Added type hints

src/PIL/Image.py

@@ -41,7 +41,7 @@ import warnings
 from collections.abc import Callable, MutableMapping
 from enum import IntEnum
 from types import ModuleType
-from typing import IO, TYPE_CHECKING, Any, Literal, Protocol, cast
+from typing import IO, TYPE_CHECKING, Any, Literal, Protocol, Sequence, cast
 
 # VERSION was removed in Pillow 6.0.0.
 # PILLOW_VERSION was removed in Pillow 9.0.0.
@@ -877,7 +877,7 @@ class Image:
                     return self.pyaccess
             return self.im.pixel_access(self.readonly)
 
-    def verify(self):
+    def verify(self) -> None:
         """
         Verifies the contents of a file. For data read from a file, this
         method attempts to determine if the file is broken, without
@@ -1267,7 +1267,9 @@ class Image:
 
         return im.crop((x0, y0, x1, y1))
 
-    def draft(self, mode, size):
+    def draft(
+        self, mode: str, size: tuple[int, int]
+    ) -> tuple[str, tuple[int, int, float, float]] | None:
         """
         Configures the image file loader so it returns a version of the
         image that as closely as possible matches the given mode and
@@ -1290,7 +1292,7 @@ class Image:
         """
         pass
 
-    def _expand(self, xmargin, ymargin=None):
+    def _expand(self, xmargin: int, ymargin: int | None = None) -> Image:
         if ymargin is None:
             ymargin = xmargin
         self.load()
@@ -3450,7 +3452,7 @@ def eval(image, *args):
     return image.point(args[0])
 
 
-def merge(mode, bands):
+def merge(mode: str, bands: Sequence[Image]) -> Image:
     """
     Merge a set of single band images into a new multiband image.
 

src/PIL/ImageFile.py

@@ -163,7 +163,7 @@ class ImageFile(Image.Image):
         self.tile = []
         super().__setstate__(state)
 
-    def verify(self):
+    def verify(self) -> None:
         """Check file integrity"""
 
         # raise exception if something's wrong.  must be called

src/PIL/JpegImagePlugin.py

@@ -424,13 +424,15 @@ class JpegImageFile(ImageFile.ImageFile):
 
         return s
 
-    def draft(self, mode, size):
+    def draft(
+        self, mode: str, size: tuple[int, int]
+    ) -> tuple[str, tuple[int, int, float, float]] | None:
         if len(self.tile) != 1:
-            return
+            return None
 
         # Protect from second call
         if self.decoderconfig:
-            return
+            return None
 
         d, e, o, a = self.tile[0]
         scale = 1

src/PIL/PngImagePlugin.py

@@ -783,7 +783,7 @@ class PngImageFile(ImageFile.ImageFile):
                 self.seek(frame)
         return self._text
 
-    def verify(self):
+    def verify(self) -> None:
         """Verify PNG file"""
 
         if self.fp is None: