code: def get_state_by_X(self, x, xtyp):
          
          _state = self.state_db.get(KEY_PATTERN[xtyp].format(x))
          if _state:
              return _state
          else:
              raise KeyError('Unknown {}: "{}"'.format(xtyp, x))
docs: Find the state value by providing the x value.
          Will raise an exception if the x value is absent from the state
          data base.
  
          :param x: The x value
          :return: The state value