# Functions
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通用InstId转InstType.
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获取现货instId的交易币种.
获取合约的保证金币种.
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是否为U本位合约.
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交易所InstId（symbol）转为通用instId 通用instId格式： 现货：btc_usdt(仅支持usdt交易对) U本位永续：btc_usdt_swap 币本位永续：btc_usd_swap.
通用instId转为交易所instId.
# Constants
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# Structs
模拟一个合约仓位，计算其盈利、手续费等.
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订单簿 为了提升加载速度，这里使用float存储 运算时要注意精度.
k线.
#region from MarketCollector k线单位(跟MarketCollector保持一致).
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截面数据 某一时刻各个品种的某一数据.
截面序列 截面序列中的data，共享相同的InstIds，数量和顺序都需要一致.
Ticker.
市场成交.