None & Ellipsis

[Fredrik Lundh]

Moshe Zadka <moshez at math.huji.ac.il> wrote
> On Sat, 19 Feb 2000, Gerrit Holl wrote:
>
> > > > >>> t=('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i')
> > > > >>> t1, t2, None, t4, t5, None, None, t8, None = t
> > > > >>> None
> > > > 'i'
> > >
> > > >>> del None
> > > >>> None
> > > >>>
> >
> > Ah...! Is this behaviour documented!
>
> Yes. It's called the "Python 3 namespace rule".

exactly.  and combined with the "local variables
are detected by static analysis" rule, things get
really weird.  consider this:

    def mylongfunction():
        a = None
        # ...
        # a few hundred lines of computation
        # ...
        a = 1, 2, 3
        None, None, b = a

this results in an exception.  on what line?

</F>