Traceback (most recent call last):                              
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/dbus/__init__.py", line 79, in <module>
    import dbus.types as types
  File "/usr/lib/python2.7/site-packages/dbus/types.py", line 6, in <module>
    from _dbus_bindings import ObjectPath, ByteArray, Signature, Byte,\
ImportError: /usr/lib/python2.7/site-packages/_dbus_bindings.so: undefined symbol: PyExc_UserWarning