Benjamin Peterson wrote:
2012/2/26 Nick Coghlan <ncogh...@gmail.com>:
Thanks for writing that up. I'd be amenable if the PEP was clearly
updated to say that ``raise exc from cause`` would change from being
syntactic sugar for ``_hidden = exc; _hidden.__cause__ = cause; raise
exc`` (as it is now) to ``_hidden = exc; _hidden.__cause__ = cause;
_hidden.__suppress_context__ = True; raise exc``. The patch should
then be implemented accordingly (including appropriate updates to the
language reference).
I add the following lines to the PEP:
To summarize, ``raise exc from cause`` will be equivalent to::
exc.__cause__ = cause
exc.__suppress_context__ = cause is None
raise exc
So exc.__cause__ will be None both before and after `raise Exception
from None`?
~Ethan~
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