code: def get_tickers_from_file(self, filename):
          
          if not os.path.exists(filename):
              log.error("Ticker List file does not exist: %s", filename)
  
          tickers = []
          with io.open(filename, 'r') as fd:
              for ticker in fd:
                  tickers.append(ticker.rstrip())
          return tickers
docs: Load ticker list from txt file