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Log('盈亏：', (price - last_price) * lots) # lots为下单的数量，price为开仓的价格，last_price为平仓的价格
# stocks为平仓操作后的余币，last_stocks为上一次的余币
Log('盈亏(币)：', _N(stocks - last_stocks), '盈亏百分比：', _N((stocks - last_stocks) / last_stocks * 100), '%')
计算的品种是OKEX期货（BTC）。这两种盈亏一个是算钱，一个是算币，值不一样可以理解，还有换算关系在，可是几乎每次的符号都是反的，钱一直是负的（高买低卖或低卖高买了），币却一直是增长的。
这是为什么？
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