[Python-Dev] PEP 409 - Accepted!

[Guido van Rossum]

There is no new syntax! It's going to remain "raise <expression1> from
<expression2>". The types of the expressions are constrained by the
runtime, not by the syntax. If either type is unacceptable, a
TypeError (with the default context :-) will be raised. None of that
is new. Really, there is no new syntax to clarify, only new allowable
types for <expression2>, and a new meaning assigned to those types.

On Fri, Feb 3, 2012 at 7:28 PM, Eli Bendersky <eliben at gmail.com> wrote:
> On Fri, Feb 3, 2012 at 22:14, Ethan Furman <ethan at stoneleaf.us> wrote:
>> Good news!  PEP 409 has been accepted!
>>
>> Not so good news:  There is no one assigned to Issue 6210 to review the
>> patches... any volunteers?
>>
>> http://bugs.python.org/issue6210
>>
>
> Hi Ethan,
>
> I've just looked at PEP 409 online
> (http://www.python.org/dev/peps/pep-0409/) and I'm not sure where it
> details the final syntax that was chosen.
>
> The "Proposal" section says:
>
> "
>    I proprose going with the second option:
>
>        raise NewException from None
> "
>
> This makes no mention of ellipsis / ....
>
> Could you please clarify the PEP to make it detail the new syntax and
> its proposed semantics more precisely?
>
> Thanks in advance,
> Eli
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-- 
--Guido van Rossum (python.org/~guido)