code: def has_data_for_dates(series_or_df, first_date, last_date):
      
      dts = series_or_df.index
      if not isinstance(dts, pd.DatetimeIndex):
          raise TypeError("Expected a DatetimeIndex, but got %s." % type(dts))
      first, last = dts[[0, -1]]
      return (first <= first_date) and (last >= last_date)
docs: Does `series_or_df` have data on or before first_date and on or after
      last_date?