default argument in method

[Jean-Michel Pichavant]

ernest wrote:
> Hi,
>
> I'd like to have a reference to an instance attribute as
> default argument in a method. It doesn't work because
> "self" is not defined at the time the method signature is
> evaluated. For example:
>
> class C(object):
>     def __init__(self):
>         self.foo = 5
>     def m(self, val=self.foo):
>         return val
>
> Raises NameError because 'self' is not defined.
> The obvious solution is put val=None in the signature
> and set val to the appropriate value inside the method
> (if val is None: ...), but I wonder if there's another way.
>
> Cheers,
> Ernest
>   
your 'val=None' is jus fine.

JM