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Have you tried lumibot yet? I think it's the most full featured/flexible backtesting library available (can trade options, multiple assets at once, etc), and it's being aggressively developed (check the commit history, there's a new version almost every week)
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Backtrader and Lean are top choices for Python backtesting—robust, flexible, and widely supported. Backtrader excels in customization, while Lean offers cloud integration and supports multiple asset classes and languages.