Class Variable Access and Assignment

[Christopher Subich]

Steven D'Aprano wrote:
> On Thu, 03 Nov 2005 14:13:13 +0000, Antoon Pardon wrote:
> 
> 
>>Fine, we have the code:
>>
>>  b.a += 2
>>
>>We found the class variable, because there is no instance variable,
>>then why is the class variable not incremented by two now?
> 
> 
> Because b.a += 2 expands to b.a = b.a + 2. Why would you want b.a =
> <something> to correspond to b.__class__.a = <something>?

Small correction, it expands to b.a = B.a.__class__.__iadd__(b.a,2), 
assuming all relevant quantities are defined.  For integers, you're 
perfectly right.