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运行 学习实例\04_策略回测.py 报错: 回测失败:'DataManager' object has no attribute 'get_trading_dates',详细日志如下:====================================================================== 开始回测(基于 Backtrader v2 - 完全修复版): 20240101 ~ 20241231 ====================================================================== ❌ 回测失败:'DataManager' object has no attribute 'get_trading_dates' �🔗可能的原因:: 1. 市值数据未下载(首次使用需要下载) 2. 日期范围内无交易日 3. 数据源连接失败 �📡解决方案:: 启动主GUI下载市值数据: cd "C:\Users\Administrator\Desktop\miniqmt扩展" python run_gui.py #24

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