This is a backport of the BaseExceptionGroup and ExceptionGroup
classes from Python 3.11.
It contains the following:
The exceptiongroup.BaseExceptionGroup and exceptiongroup.ExceptionGroup
classes
A utility function (exceptiongroup.catch()) for catching
exceptions possibly nested in an exception group
Patches to the TracebackException class that properly formats
exception groups (installed on import)
An exception hook that handles formatting of exception groups
through TracebackException (installed on import)
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