On Mon, 2008-03-17 at 15:42 +0100, Duncan Webb wrote:
> class A:
>     def __init__(self, l=[]):
>         self.l = l

Note that this creates a default list for l only once at
class-declaration time.  All instances of A will share this list.  This
is a common python gotcha.  You might want instead:

        class A:
           def __init__(self, l=None):
              self.l = l or []
        

> This behaviour seems a bit strange, clearly list is class A is the same 
> objects for both instances and I'm wondering if this is correct?

Yes, it's expected behaviour.

Cheers,
Jason.


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