主题：发现python回测的时候，每逢9点40账户市值要跳变

# 现金余额
total_cash = get_account(3, context.account_id)

# 浮动盈亏
pnl = get_account(5, context.account_id)

# 当前交易帐户中的动态权益/资产值
total_value = get_account(6, context.account_id)

# 当前可用资金
available_cash = get_account(19, context.account_id)

# 占用保证金/证券市值
stock_value = get_account(28, context.account_id)

if context.total_value > 0:
    total_change_percent = 100 * (total_value - context.total_value) / context.total_value

		if total_change_percent > 11:
        context.log_error(

		"[{}] {} handle_bar value:{} -> {}".format(current_dt,
                                                       context.i,
                                                       context.total_value,
                                                       total_value))
        portfolio_book = get_portfolio_book(0, context.account_id)

		print(portfolio_book)

		else:
        context.log_info(

		"[{}] {} handle_bar total_cash:{} pnl:{} total_value:{} available_cash:{} stock_value:{}".format(
                current_dt,
                context.i,
                total_cash,
                pnl,
                total_value,
                available_cash,
                stock_value))