code: def listar(self):
          
  
          code, xml = self.submit(None, 'GET', 'net_type/')
  
          key = 'net_type'
          return get_list_map(self.response(code, xml, [key]), key)
docs: List all network types.
  
          :return: Following dictionary:
  
          ::
  
              {'net_type': [{'id': < id_tipo_rede >,
              'name': < nome_tipo_rede >}, ... other network types ...]}
  
          :raise DataBaseError: Networkapi failed to access the database.
          :raise XMLError: Networkapi failed to generate the XML response.