title: checking whether an object is a boost python object from python
body: <p>Is there a way I can test to see if an object is a boost class from within python by using the <code>isinstance</code> function?</p>
  
  <p>I can see this visually doing something like <code>object.__class__.__mro__</code>, which will return something like <code>(_user_library.SomeCppClass, Boost.Python.instance, object)</code></p>
  
  <p>I couldn't figure out how to test this though in code, since I'm not sure where to import <code>Boost.Python.class</code> from.</p>