docs: def high_or_low(self,one,two,rev=0):
      """ Return ↑↓- for high, low or equal.
          回傳漲跌標示
          rev = 0
            回傳 ↑↓-
          rev = 1
            回傳 1 -1 0
      """
      if rev == 0:
        if one > two:
          re = '↑'.decode('utf-8')
        elif one < two:
          re = '↓'.decode('utf-8')
        else:
          re = '-'.decode('utf-8')
      else:
        if one > two:
          re = 1
        elif one < two:
          re = -1
        else:
          re = 0
      return re