Backtrader

backtrader is a powerful and flexible Python framework for backtesting trading strategies, analyzing financial data, and live trading. It provides a robust engine for simulating market conditions, managing portfolios, and executing trades based on defined rules. The current stable version is 1.9.78.123, with a major 2.x release under active development that introduces significant changes. Its release cadence is sporadic but active, with bug fixes and minor features released as needed.