Added type hints to ImageFile.__init__()

[radarhere]

Aside from the obvious type hinting, this has two changes.

1. Require fp in
   

   Pillow/src/PIL/ImageFile.py

   Lines 107 to 110 in 44c2ff3

   	class ImageFile(Image.Image):
   	"""Base class for image file format handlers."""
   	def __init__(self, fp=None, filename=None):

   
   It will become the stream that is used by plugins, so there's no reason for it to be None.

2. Rather than allowing im.tile to be None
   

   Pillow/src/PIL/ImageFile.py

   Line 117 in 44c2ff3

   self.tile = None

   
   

   Pillow/src/PIL/ImageFile.py

   Lines 178 to 185 in 44c2ff3

   	def load(self) -> Image.core.PixelAccess | None:
   	"""Load image data based on tile list"""
   	if self.tile is None:
   	msg = "cannot load this image"
   	raise OSError(msg)
   	pixel = Image.Image.load(self)

   
   I have changed the check to
   

   Pillow/src/PIL/ImageFile.py

   Line 189 in d00f365

   if not self.tile and self._im is None:

   
   as it seems simpler from a type hinting perspective. If there is no tile to load, and no core image object already loaded, then this image cannot be loaded.

[Yay295]

this can be self.filename = filename or ""

[radarhere]

It's not exactly the same. This suggestion would mean that a filename of b"" would be unexpectedly changed to ""

>>> filename = b""
>>> filename if filename is not None else ""
b''
>>> filename = b""
>>> filename or ""
''

[Yay295]

Interesting, I hadn't thought of that situation.