我编的Python模块的策略在免费版和标准版的金字塔上运行时，交易语句没有执行，是在实盘上运行模拟账户，Handle Bar段的代码是：

    Trade=[] 
    for i in context.Label:
        Trade1 = getextdata(i)
        if Trade1 is not(None):
            Trade.append( Trade1 )
            write_logging (i)
            print (Trade1)
        portfolio=get_portfolio (i,0)
        buy_position = portfolio.buy_quantity
        sell_position = portfolio.sell_quantity
        write_logging("Buy position")
        print (buy_position)
        print (context.PO)
        if Trade1==1:
            if sell_position>0:
                buy_close(i, "Market",0,volume=sell_position)
            if buy_position>0 and buy_position<context.PO:
                buy_open(i, "Market", 0, volume=context.PO-buy_position)
            if buy_position>context.PO:
                sell_close(i, "Market",0,volume=buy_position-context.PO)
            if buy_position==0:
                buy_open(i, "Market",0,volume=context.PO)
        if Trade1==0:
            if buy_position>0:
                sell_close(i, "Market",0,volume=buy_position)
            if sell_position>0:
                buy_close(i, "Market",0,volume=sell_position)
        if Trade1==-1:
            if buy_position>0:
                sell_close(i, "Market",0,volume=buy_position)
            if sell_position>0 and sell_position<context.PO:
                sell_open(i, "Market", 0, volume=context.PO-sell_position)
            if sell_position>context.PO:
                buy_close(i, "Market",0,volume=sell_position-context.PO)
            if sell_position==0:
                sell_open(i, "Market", 0, volume=context.PO)

说明一下，context.Label是我的合约池，从全局变量得到原来金字塔策略指标的开平仓信号Trade1，然后根据Trade1信号与账户实际仓位发出开平仓指令，合约池的合约代码，全局变量得到的Trade1，都Print出来看了没有问题，有几个品种的Trade<>0且账户无仓位，但是运行中无任何交易发生，请帮分析一下是什么问题？？?

print (context.PO)
print(i)

buy_open(i, "Market",0,volume=context.PO)

把下面逻辑注释掉，用这个测试下呢,看下输出数量和品种代码都是怎么样