[Python-ideas] PEP 505: None-aware operators: operators ?= and ?? and OR

[Eric Fahlgren]

On Thu, Aug 2, 2018 at 1:22 PM MRAB <python at mrabarnett.plus.com> wrote:

> > policy?.mangle_from_ ?? True
> > True (??? since lhs is None?)
> >
> No, it's not 'policy.mangle_from_' that could be None, it's 'policy'
> that could be None (i.e. there's no policy).
>

In my example, there is a policy, and the value of policy.mangle_from_ is
set to None.  Thus the above should be equivalent to this

>>> None ?? True
True

Unless, of course, I completely misunderstand the way the ?? operator
works.  This is not the same as the original code, they are not equivalent.
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