code: def bulkMinuteBarsDF(symbol, dates, token='', version=''):
      '''fetch many dates worth of minute-bars for a given symbol'''
      data = bulkMinuteBars(symbol, dates, token, version)
      df = pd.DataFrame(data)
      if df.empty:
          return df
      _toDatetime(df)
      df.set_index(['date', 'minute'], inplace=True)
      return df bulkMinuteBarsDF(symbol, dates, token='', version=''):
      '''fetch many dates worth of minute-bars for a given symbol'''
      data = bulkMinuteBars(symbol, dates, token, version)
      df = pd.DataFrame(data)
      if df.empty:
          return df
      _toDatetime(df)
      df.set_index(['date', 'minute'], inplace=True)
      return df
docs: fetch many dates worth of minute-bars for a given symbol