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Re: while expression feature proposal

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Thu, 25 Oct 2012 10:44:17 -0600
Subject Re: while expression feature proposal
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On Thu, Oct 25, 2012 at 3:52 AM, Thomas Rachel
<nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
wrote:
> Am 25.10.2012 06:50 schrieb Terry Reedy:
>
>
>> Keep in mind that any new syntax has to be a substantial improvement in
>> some sense or make something new possible. There was no new syntax in
>> 3.2 and very little in 3.3.
>
>
> I would consinder this at least as new substantial than
>
>     yield_from it
>
> as opposed to
>
>     for i in it: yield i
>
> - although I think that was a good idea as well.

Except that those two are not exactly identical, because "yield from"
also properly delegates sent data and exceptions to the sub-generator.
 The actual equivalent code for "yield from expr()", as given in the
PEP, is 39 lines long.  This is a substantial feature, not just a
little syntactic sugar.

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Thread

Re: while expression feature proposal Terry Reedy <tjreedy@udel.edu> - 2012-10-25 00:50 -0400
  Re: while expression feature proposal Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-10-25 11:52 +0200
    Re: while expression feature proposal Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-10-25 10:50 +0000
      Re: while expression feature proposal Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-10-25 13:20 +0200
      Re: while expression feature proposal Terry Reedy <tjreedy@udel.edu> - 2012-10-25 16:09 -0400
    Re: while expression feature proposal Ian Kelly <ian.g.kelly@gmail.com> - 2012-10-25 10:44 -0600
  Re: while expression feature proposal Grant Edwards <invalid@invalid.invalid> - 2012-10-25 14:17 +0000

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