<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def list(self, request, *args, **kwargs):
 """ Filter services by type ^^^^^^^^^^^^^^^^^^^^^^^ It is possible to filter services by their types. Example: /api/services/?service_type=DigitalOcean&service_type=OpenStack """

        return super(ServicesViewSet, self).list(request, *args, **kwargs)