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Tue Apr 7 14:26:51 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-April/139060.html

On Tue, 07 Apr 2015 03:11:30 +0100
Rob Cliffe <rob.cliffe at btinternet.com> wrote:
> 
> On 07/04/2015 02:08, 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
> >     asreturn None, and an explicit return statement should be present
> >     at the end of the function (if reachable).
> >
> >     Yes:
> >
> >     def foo(x):
> >          if x >= 0:
> >              return math.sqrt(x)
> >          else:
> >              return None
> >
> That would seem to be good style and common sense.
> 
> As a matter of interest, how far away from mainstream am I in 
> preferring, *in this particular example* (obviously it might be 
> different for more complicated computation),
> 
>      def foo(x):
>          return math.sqrt(x) if x >= 0 else None

I agree with you on this.

Regards

Antoine.

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[Python-Dev] PEP 8 update