Brett Cannon added the comment: OK, then why don't we just make create_module() a required method to use exec_module(), add a DeprecationWarning for when it isn't defined, leave Loader.create_module() as-is (already returns None), and then plan to make it a requirement in Python 3.6 since the fix is so simple. That leaves the None return value for pragmatic reasons but makes it only way to specify the default instead of 2.
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