ints = filter(lambda x: isinstance(x, (int, long)), session_filter)
strs = filter(lambda x: isinstance(x, StringTypes), session_filter)
session_filter = Filter(Session.fields, {'person_id': ints, 'session_id': strs})
ints = filter(lambda x: isinstance(x, (int, long)), session_filter)
strs = filter(lambda x: isinstance(x, StringTypes), session_filter)
session_filter = Filter(Session.fields, {'person_id': ints, 'session_id': strs})