Scope rule pecularities

[Yermat]

Antoon Pardon wrote:
> [...]
>   a1 = Int(14)
>   a2 = Int(15)
>   b = Int(23)
>   
>   print a1, a2 
>   
>   def foo():
>   
>     a1 += b 
>     a2.__iadd__(b)
>     
>   foo()
>   
>   print a1, a2
> 
> 
> Now the a1 += b line doesn't work, it produces the following error:
> 
>   UnboundLocalError: local variable 'a1' referenced before assignment.
> 
> The a2.__iadd__(b) line however works without trouble.
> 
> 
> Now I think I understand what is causing this, but I think this
> kind of thing shouldn't happen. If a += b is just syntatic sugar
> for a.__iadd__(b) then the first should be acceptable where the
> second is acceptable.
> 

Here we are again !
Do you mind to try :

def foo():
     global a1, a2
     a1 += b
     a2.__iadd__(b)

Note also that the second line were not executed so you can't know if it 
were working...

-- 
Yermat