code: def best_four_point_to_buy(self):
          
          result = []
          if self.check_mins_bias_ratio() and \
              (self.best_buy_1() or self.best_buy_2() or self.best_buy_3() or \
               self.best_buy_4()):
              if self.best_buy_1():
                  result.append(self.best_buy_1.__doc__.strip().decode('utf-8'))
              if self.best_buy_2():
                  result.append(self.best_buy_2.__doc__.strip().decode('utf-8'))
              if self.best_buy_3():
                  result.append(self.best_buy_3.__doc__.strip().decode('utf-8'))
              if self.best_buy_4():
                  result.append(self.best_buy_4.__doc__.strip().decode('utf-8'))
              result = ', '.join(result)
          else:
              result = False
          return result
docs: 判斷是否為四大買點
  
              :rtype: str or False