Exception Handling in Python 3

[Martin v. Loewis]

Am 24.10.2010 07:01, schrieb Steve Holden:
> I was somewhat surprised to discover that Python 3 no longer allows an
> exception to be raised in an except clause (or rather that it reports it
> as a separate exception that occurred during the handling of the first).

I think you are misinterpreting what you are seeing. The exception being
raised actually *is* an attribute error, and it actually is the
attribute error that gets reported. It's only that reporting an
exception that has a __context__ first reports the context, then reports
the actual exception.

You may now wonder whether it is possible to set __context__ to None
somehow. See PEP 3134:

Open Issue: Suppressing Context

    As written, this PEP makes it impossible to suppress '__context__',
    since setting exc.__context__ to None in an 'except' or 'finally'
    clause will only result in it being set again when exc is raised.

Regards,
Martin