TqSdk is a Python SDK for quantitative trading in Chinese futures, options, and stock markets. It provides a unified async event-driven framework for real-time market data, historical data download, backtesting, simulation, and live trading through multiple broker gateways (CTP, SimNow, etc.). The core architecture centers on a TqApi class that manages WebSocket connections, diff-based data synchronization, and a wait_update() loop. It includes a comprehensive technical analysis library (tafunc/ta), target position management (TargetPosTask), risk management rules, and a web-based GUI. While primarily an application library for building trading strategies, it also contains data analysis components like technical indicators and backtest report generation, making it a hybrid tool with a strong application focus.