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copied!<p>I usually do things like this with explicit <code>pythoncode</code> blocks in the interface file:</p> <pre><code>%pythoncode %{ def _special_python_member_function(self): print "hello" self.rotate() # some function of Sphere Sphere.new_functionality=_special_python_member_function %} </code></pre> <p>So you can add arbitrary python functionality to the class, on top of what the SWIG interface provides. You may want/need to <code>rename</code> some of the C functionality out the way but this can should get you all of the member <em>functions</em> you want.</p> <p>I've never tried to remap <code>__init__</code> in this way, so I don't know how that would behave. Assuming that it won't work, you won't be able to ensure that the python objects have a given internal state (member variables) at construction.</p> <p>What you will be forced to do is do lazy evaluation:</p> <pre><code>def function_that_depends_on_python_specific_state(self, *args): if not hasatttr( self, 'python_data'): self.python_data = self.make_python_data() # construct the relevant data pass # do work that involves the python specific data </code></pre> <p>and check for the existence of the python specific data. If there is just a few cases of this, I'd just put it in the functions as above. However, if that ends up being messy, you could modify <code>__getattr__</code> so that it constructs the python-specific data members as they are accessed.</p> <pre><code>def _sphere_getattr(self, name): if name=='python_data': self.__dict__[name]=self.make_python_data() return self.__dict__[name] else: raise AttributeError Sphere.__getattr__ = _sphere_getattr </code></pre> <p>IMHO, in the limit where you have a large amount of new functionality, and data that are independent of the underlying C implementation, you are in effect asking "How can I make my python Sphere class be a sub-class ofthe C Sphere class but keep them as the same type?"</p>

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