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March 18, 2021
10:44 p.m.
We believe that we have found a simple way to make it possible to subclass exception groups, with fully functioning split() and subgroup(). See this section in the PEP: https://www.python.org/dev/peps/pep-0654/#subclassing-exception-groups It was also added to the reference implementation. This probably opens new possibilities for adoption strategies of exception groups and except* (in terms of the interaction of exception groups with except).