Pass file handle to ContainerIO by radarhere · Pull Request #8625

Pass file handle to ContainerIO by radarhere · Pull Request #8625 · python-pillow/Pillow

This is part of #8362 - I'm hoping to break down that PR into easier-to-review chunks.

#7656 set ContainerIO to receive IO as the type of the first argument.

def __init__(self, file: IO[AnyStr], offset: int, length: int) -> None:

Currently, test_file_container.py passes an image instance to it sometimes - the wrong type.

	with hopper() as im:
	container = ContainerIO.ContainerIO(im, 0, 0)

This PR fixes that, passing a file handle to it like the rest of the test file does.

	with open(TEST_FILE, "rb") as fh:
	container = ContainerIO.ContainerIO(fh, 22, 100)