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[Python-Dev] PEP 415: Implementing PEP 409 differently
Ethan Furmanethan at stoneleaf.us
Mon Feb 27 19:22:05 CET 2012
Benjamin Peterson wrote:> 2012/2/26 Nick Coghlan <ncoghlan at 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 excSo exc.__cause__ will be None both before and after `raise Exception from None`?~Ethan~
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