code: def S1(self):
      ''' 量大收黑 '''
      return self.a.stock_vol[-1] > self.a.stock_vol[-2] and not self.a.PUPTf S1(self):
      ''' 量大收黑 '''
      return self.a.stock_vol[-1] > self.a.stock_vol[-2] and not self.a.PUPTY
docs: 量大收黑