code: def walk_oid(self, oid):
          
          var = netsnmp.Varbind(oid)
          varlist = netsnmp.VarList(var)
          data = self.walk(varlist)
          if len(data) == 0:
              raise SnmpException("SNMP walk response incomplete")
          return varlist
docs: Get a list of SNMP varbinds in response to a walk for oid.
          
          Each varbind in response list has a tag, iid, val and type attribute.