On Apr 8, 2015 2:16 PM, "Andreas Hilboll" <lists@hilboll.de> wrote:
>
> Hi all,
>
> I'm commonly using function signatures like
>
> def myfunc(a, b, c=None):
> if c is None:
> # do something ...
> ...
>
> where c is an optional array argument. For some time now, I'm getting a
>
> FutureWarning: comparison to `None` will result in an elementwise
> object comparison in the future
>
> from the "c is None" comparison. I'm wondering what would be the best
> way to do this check in a future-proof way?
As far as I know, you should be getting the warning when you write
c == None
and the fix should be to write
c is None
instead. (And this is definitely an important fix -- it's basically a bug in numpy that the == form ever worked.) Are you certain that you're getting warnings from 'c is None'?
-n