> if (obj) ...

> 
> is definitely the right way to do it.

Sorry to correct, but it isn't equivalent to "obj is None".
if (obj) uses PyObject_IsTrue(); see
boost/python/object_operators.hpp line 60.

I'll add

  obj.is_none()

and

  obj.is_not_none()

when I get a chance.

Ralf
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