Open Stack

On Wed, Jan 30, 2013 at 10:36 PM, Zhongyue Luo <zhongyue.nah at intel.com>wrote:

> Hi, all
>
> After submitting a patch to fix some "if not X in Y" to "if X not in Y", I
> got advice from someone that we should first ask everyone about their
> preference between "if X not in Y" and "if not X in Y".
>
> I have many reasons why we should use "if X not in Y", but lets first look
> at some statistics.
>
> In the ten major project of OpenStack (oslo, nova, glance, keystone,
> quantum, cinder, swift, horizon, ceilometer, tempest - personal thought),
> the occurrence of "if X not in Y" is 560 compared to the 152 of "if not X
> in Y".
>
> https://etherpad.openstack.org/notin
>
> So I guess it is fair to say that the implied consensus of how to evaluate
> an element in a iterable is "if X not in Y".
>
> What I'm suggesting is that we should add an entry in HACKING.rst stating
> we should use "if X not in Y" and prevent mix use of the two.
>
> Would there be any reason why we shouldn't do this? such as it adds more
> burden to reviewers, or because we should have the freedom to choose
> whatever we want to use?
>
> --
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>
Personally I'm a fan of consistency for things such as this and IMO "if x
not in y" is correct.  I'm fine with adding it to hacking in Cinder at any
rate.

John
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