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From: Xavi <jarabal@gmail.com>
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Xref: csiph.com comp.lang.python:52394

Thanks to all for your answers,

I guess it is more flexible with isinstance (the duck test :)
I'm going to change the type checks.

Respect to the "Names starting and ending with double-underscore".
I don't know how to get the name of a classe without them.
obj.__class__.__name__

Thanks.
-- 
Xavi