Chris Withers wrote:

> Steve Alexander wrote:
>> If ob is not found, you'll get an error raised. You need to have some
>> sort of marker for the default value.
> Is there any reason why no-one uses None as a marker?

Yes. An attribute that exists can have the value None.

class foo:

You need to distinguish between this case, and the case where the 
attribute does not exist.

Steve Alexander
Software Engineer
Cat-Box limited

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