bd9363f6fc6b12ee8953683d6e53cead89fc99e7
2. Add `DDBBase` class to decrease repeated class-level constant definitino. 3. Add `DDBExpression` class for single quarter calculation and yoy claculation.
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Python语言从数据库中读取字节流程序并解码还原示例程序在ReadTickFromDB.py中。 该函数需要pymssql、gzip、google.protobuf(可用pip install protobuf安装)三个外部依赖库需要在运行程序。 成功读取后,每个标的会读出并解析成一个结构体数组的数据结构,可以对于该数据进行进一步操作。
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