[Python-ideas] Why does += trigger UnboundLocalError?

[Ethan Furman]

Steven D'Aprano wrote:
> Carl M. Johnson wrote:
> 
>> Agreed, sure, we have to treat the LHS of = as
>> a local. But += is fundamentally different. 
> 
> 
> No it's not. It is fundamentally the same. Augmented assignment in 
> Python *is* assignment, equivalent to x = x.__iadd__(other).

Or x = x.__add__(other) if no __iadd__ exists for the object.

~Ethan~