docs: def set_source_quandl(self, quandl_token):
          """
          Set data source to Quandl
          """
          self.data_worker = data_worker
          self.worker_args = {"function": Quandl.get, "input": self.input_queue, "output": self.output_map,
                              "token": quandl_token}
          self.source_name = "Quandl"