Extending objects by a method?

[Karsten Wutzke]

Hello,

I'm new to Python so beware.

I have a hierarchical object structure which I iterate over (the
elements/classes of interest). I would like to apply the Visitor
pattern onto this object structure, so I must add an "accept" method
to every object (I'm interesting in) for the Visitor pattern to work.

Is there any Python-inbuilt way to dynamically add a method or do I
have to wrap each iterated object into a Decorator supplying the
accept method? The latter would mean having to rebuild the (part)
hierarchy with the Decorator objects before running the Visitor, which
I'd like to avoid.

Karsten