how do i create such a thing?

[Lowell Kirsh]

I want to create a class called DefaultAttr which returns a default 
value for all attributes which haven't been given values yet. It will 
work like this:

>> x = DefaultAttr(99)
>> print x.foo
99
>> print x.bar
99
>> x.foo = 7
>> print x.foo
7
I already have a similar class called DefaultDict which works similarly 
which I assume would be a good thing to use.

Lowell
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