[Python] I have read an image file into a `bytes` object. How do I use `PIL.Image.frombytes`...

I'd like to create a PIL image from data read from an image file. I believe I'm supposed to use PIL.Image.frombytes. But it has a size argument. I don't know the size of the image, isn't that supposed to come as part of the image? I don't know the size of the image in advance. How am I supposed to call the function with no size?

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