code: def QA_indicator_OBV(DataFrame):
      
      VOL = DataFrame.volume
      CLOSE = DataFrame.close
      return pd.DataFrame({
          'OBV': np.cumsum(IF(CLOSE > REF(CLOSE, 1), VOL, IF(CLOSE < REF(CLOSE, 1), -VOL, 0)))/10000
      })
docs: 能量潮