docs: def get_active_conditions(self, manager):
          '''
          Returns a generator which yields groups of lists of conditions.
  
          >>> conditions = switch.get_active_conditions()
          >>> for label, set_id, field, value, exc in conditions: #doctest: +SKIP
          >>>     print ("%(label)s: %(field)s = %(value)s (exclude: %(exc)s)"
          >>>            % (label, field.label, value, exc)) #doctest: +SKIP
          '''
          for condition_set in sorted(manager.get_condition_sets(),
                                      key=lambda x: x.get_group_label()):
              ns = condition_set.get_namespace()
              condition_set_id = condition_set.get_id()
              if ns in self.value:
                  group = condition_set.get_group_label()
                  for name, field in condition_set.fields.iteritems():
                      for value in self.value[ns].get(name, []):
                          try:
                              yield (condition_set_id, group, field, value[1],
                                     value[0] == EXCLUDE)
                          except TypeError:
                              continue