set_key states "If the .env path given doesn't exist, fails instead of risking creating an orphan .env somewhere in the filesystem".

set_key has no check if the file exists. As it uses rewrite which if path passed is not a file, it creates an empty file.

if not os.path.isfile(path):
        with open(path, mode="w", encoding=encoding) as source:
            source.write("")