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> Here is a patch for import.c.
Looks good to me.
> This new patch also fixes importlib.
"""
 path_tmp = path + '.tmp'
 with _io.FileIO(path_tmp, 'wb') as file:
 file.write(data)
 _os.rename(path_tmp, path)
"""
I don't know exactly the context in which this code runs, but you can have a corruption if multiple processes try to write the bytecode file at the same time, since they'll all open the .tmp file: it should be opened with O_EXCL.
Also, as a side note, I'm wondering whether this type of check:
"""
 if not sys.platform.startswith('win'):
 # On POSIX-like platforms, renaming is atomic
"""
couldn't be rewritten as
"""
 if os.name == 'posix':
 # On POSIX-like platforms, renaming is atomic
"""
Fox example, does OS-X report as POSIX?