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With issue #15031 providing a way to take a bytecode file and get a code object out of it, there should probably be a comparable method that takes a code object and a path stats dict and returns the bytes to write out to a file.
This could also be a slight performance win for subclasses of SourceLoader which can read bytecode files but not write them (e.g. zip files where the cost of modifying a zip file is too high). That way the method could raise NotImplementedError (or return None) to signify it doesn't want anything written out by SourceLoader.get_code() and thus skip the entire step of preparing the bytecode file bytes instead of what happens now where set_data() raises NotImplementedError after the whole set of bytes is constructed.
More importantly, it would clean up py_compile once issue #15627 is in with an 'optimize' flag as py_compile.compile() would essentially become ``source = loader.get_source(...); code = loader.compile_source(source, optimize=...); pyc_bytes = loader.create_bytecode_file(code, loader.path_stats(...))``. Otherwise get_code() will need to grow an 'optimize' flag and that doesn't seem necessary.

@Brett as #15627 is in would you like to follow up on this.

I think I want to keep bytecode files as optimizations as much as possible, so exposing anything that explicitly writes them is just going to lead to headaches.