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copied!<pre><code>from enthought.traits.api import HasStrictTraits, Instance, Property class ExternalModel(object): foo = 'foo' class TraitsModel(HasStrictTraits): _e = Instance(ExternalModel, ExternalModel()) def __init__(self): ''' >>> wrapper = TraitsModel() >>> wrapper.foo 'foo' >>> wrapper._e.foo = 'bar' >>> wrapper.foo 'bar' >>> wrapper.trait_names() ['trait_added', '_e', 'foo', 'trait_modified'] ''' HasStrictTraits.__init__(self) for trait in (name for name in dir(self._e) if not name.startswith('__')): self.__class__.add_class_trait( trait, Property( lambda:getattr(self._e, trait), lambda attr:setattr(self._e, trait, attr) ) ) if __name__ == '__main__': import doctest doctest.testmod() </code></pre> <p>A fairly robust solution is to use the <a href="http://www.cs.nott.ac.uk/~jvb/ETS34_API/enthought.traits.has_traits.HasTraits.html#_add_class_trait" rel="nofollow"><code>add_class_trait</code></a> of the <code>HasTraits</code> class, coupled with <code>dir(self._e)</code> to get the names of the <em>class</em> attributes of <code>ExternalModel</code> and a generator expression/list comprehension to filter the magic class method names (<code>filter</code> with an appropriate function would work better for wrapping a more complex class).</p> <p>Also:</p> <ul> <li><p><code>ExternalModel</code> should inherit from <code>object</code></p></li> <li><p><code>__init__</code> should call <code>HasStrictTraits.__init__</code> (or <code>super(HasStrictTraits, self).__init__()</code>)</p></li> <li><p><code>_e</code> can also be created in the Instance trait declaration as the second argument using <code>ExternalModel()</code> or even <code>()</code>, or as a method of TraitsModel like:</p> <pre><code>def __e_default(self): # note preceding underscore return ExternalModel() </code></pre></li> </ul> <p>Lastly, I have an <a href="http://www.cs.nott.ac.uk/~jvb/ETS34_API/enthought.html" rel="nofollow">slightly old copy of the Enthought APIs including Traits</a> which can be very handy.</p>

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