[Python-Dev] PEP 8 update

[Barry Warsaw]

On Apr 06, 2015, at 06:08 PM, Guido van Rossum wrote:

>I've taken the liberty of adding the following old but good rule to PEP 8
>(I was surprised to find it wasn't already there since I've lived by this
>for ages):
>
>   Be consistent in return statements. Either all return statements in a
>   function should return an expression, or none of them should. If any return
>   statement returns an expression, any return statements where no value is
>   returned should explicitly state this as return None, and an explicit
>   return statement should be present at the end of the function (if
>   reachable).

+1

Odd synchronicity: Today I discovered an old interface that was documented as
returning a "thing or None" but the latter was relying on implicit None return
in some cases.  Fixed of course in exactly the way PEP 8 now recommends. :)

Cheers,
-Barry