Doesn't the same issue exist for all other uses of the idiom, though?
Python provides container "truthiness" even though `len(x) == 0` is more
"correct."

On Fri, Jun 5, 2015, 3:20 PM Yury Selivanov <report@bugs.python.org> wrote:

>
> Yury Selivanov added the comment:
>
> Nathan, consider the following signature:
>
>   def foo(a=0:''): pass
>
> now, sig.parameters['a'].annotation will be '' and .default will be 0, and
> they will fail 'if param.annotation or param.default' check.  That's why we
> encourage checks like 'if param.annotation is not param.empty'.
>
> Closing this issue.
>
> ----------
> assignee:  -> yselivanov
> nosy: +yselivanov
> resolution:  -> rejected
> status: open -> closed
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue23653>
> _______________________________________
>