instead of a :class:`bytes` instance.
(Contributed by Victor Stinner in :issue:`21071`.)
-* :mod:`argparse` subparsers are now required by default. This matches the
- behaviour in Python 2. To add an optional subparser, pass
- ``required=False`` to
- :meth:`ArgumentParser.add_subparsers() <argparse.ArgumentParser.add_subparsers>`.
- (Contributed by Anthony Sottile in :issue:`26510`.)
-
* :meth:`ast.literal_eval()` is now stricter. Addition and subtraction of
arbitrary numbers are no longer allowed.
(Contributed by Serhiy Storchaka in :issue:`31778`.)