code: def get_parameter(self, param_name: str) -> Parameter:
          
          for p in self.parameters:
              if p.name == param_name:
                  return p
          raise SDKException(ErrorCode.param_err('get parameter failed.'))
docs: This interface is used to get a Parameter object from an AbiFunction object
          which contain given function parameter's name, type and value.
  
          :param param_name: a string used to indicate which parameter we want to get from AbiFunction.
          :return: a Parameter object which contain given function parameter's name, type and value.