code: def update_port_for_ip_address(context, ip_id, id, port):
      
      LOG.info("update_port %s for tenant %s" % (id, context.tenant_id))
      sanitize_list = ['service']
      with context.session.begin():
          addr = db_api.ip_address_find(context, id=ip_id, scope=db_api.ONE)
          if not addr:
              raise q_exc.IpAddressNotFound(addr_id=ip_id)
          port_db = db_api.port_find(context, id=id, scope=db_api.ONE)
          if not port_db:
              raise q_exc.PortNotFound(port_id=id)
          port_dict = {k: port['port'][k] for k in sanitize_list}
  
          require_da = False
          service = port_dict.get('service')
  
          if require_da and _shared_ip_and_active(addr, except_port=id):
              raise q_exc.PortRequiresDisassociation()
          addr.set_service_for_port(port_db, service)
          context.session.add(addr)
      return v._make_port_for_ip_dict(addr, port_db)
docs: Update values of a port.
  
      : param context: neutron api request context
      : param ip_id: UUID representing the ip associated with port to update
      : param id: UUID representing the port to update.
      : param port: dictionary with keys indicating fields to update.
          valid keys are those that have a value of True for 'allow_put'
          as listed in the RESOURCE_ATTRIBUTE_MAP object in
          neutron/api/v2/attributes.py.