New submission from Brett Cannon:
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
components: Library (Lib)
stage: test needed
title: Method on importlib.SourceLoader for creating bytecode file
versions: Python 3.4
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