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教程：适用于 - 下单仅有【个数】选项，无【USDT价值】选项的交易
下单个数 = 开仓USDT价值 除以 当前价格，取交易所精度最小变动单位
精度最小变动单位：例如 盘口数量为 1.315，那么最小变动单位为小数位=3
def transform_num(trade_usdt, price, num_precision):
return round(trade_usdt / price, num_precision)
num = transform_num(USDT价值, 当前价格, 保留小数位)
以上是Python代码示例，可供参考。
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