code: def average_true_range_percent(close_data, period):
      
      catch_errors.check_for_period_error(close_data, period)
      atrp = (atr(close_data, period) / np.array(close_data)) * 100
      return atrp
docs: Average True Range Percent.
  
      Formula:
      ATRP = (ATR / CLOSE) * 100