Remove a sentence that says that BaseException inherits from BaseException.
(I guess this is just a copy & paste mistake.)
to be attached to the exception, attach it through arbitrary attributes on the
instance. All arguments are also stored in \member{args} as a tuple, but it will
eventually be deprecated and thus its use is discouraged.
-\versionchanged[Changed to inherit from \exception{BaseException}]{2.5}
\versionadded{2.5}
\end{excdesc}
All built-in, non-system-exiting exceptions are derived
from this class. All user-defined exceptions should also be derived
from this class.
+\versionchanged[Changed to inherit from \exception{BaseException}]{2.5}
\end{excdesc}
\begin{excdesc}{StandardError}