if not inverse:
turnover = trade.volume * size * trade.price
self.trading_pnl += pos_change * \
(self.close_price - trade.price) * size
self.slippage += trade.volume * size * slippage
感觉在卖出时的收益应该为前一日的收盘价格减去当日的交易价格,而不是采用当日的收盘价格close_price,是否应该为 (pre_close- trade.price) size
self.slippage += trade.volume size * slippage