sqlalchemy.extract('year', model.MyRecord.dfield) == selected_year对于参考网址：https
://docs.sqlalchemy.org/en/13/core/sqlelement.html#sqlalchemy.sql.expression.extract
sqlalchemy.extract('year', model.MyRecord.dfield) == selected_year对于参考网址：https
://docs.sqlalchemy.org/en/13/core/sqlelement.html#sqlalchemy.sql.expression.extract
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