[Edu-sig] implementing summation notation (in Scheme & Python)

[Kirby Urner]

>augmented assignment is a 'name binding operation', which causes the
>name 'a' to be used a a local variable in 'bar' rather than included
>from the containing scope ('foo').  Note that this is done at compile
>time, not runtime as you suggested (there isn't much of a difference
>in Python, but there is one), because the function bar (like all
>functions) was fully compiled before the call to it in foo.
>

Thanks for quoting the relevant PEP.  Helpful.

Kirby