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[Python-ideas] Globalize lonely augmented assignment

Georg Brandl g.brandl at gmx.net
Sun Jun 13 12:12:52 CEST 2010 
Am 13.06.2010 02:19, schrieb Greg Ewing:
> Georg Brandl wrote:
> 
>>    a += b   is equivalent to
>>    a = a.__iadd__(b)
> 
> It's not quite the same as that, because if a stands for an
> indexed expression, the index is only evaluated once.
> 
>> With the proposal, it would be much more complicated and dependent on
>> the context: "... it's the same as <code>, but if the name would only
>> be made a local by augmented assignment statements, it's automatically
>> made nonlocal if there's a matching non-local binding, or global
>> otherwise."
> 
> It doesn't have to be as complicated as that -- you only need
> to add something like "except that if the LHS is a bare name,
> it does not imply that the name is local." Any context-dependent
> effects then follow from the existing scope rules.

They don't -- as I said in the other mail, there is no "existing scope
rule" that covers assignments that are implicitly global or nonlocal.

Georg

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