Top Python Libraries

Top Python Libraries

Unlock LEAN: Master Algorithmic Trading with Python

Discover LEAN: the open-source Python quant platform for algorithmic trading. Backtest & deploy strategies with ease. Start your quant journey now.

Meng Li's avatar
Meng Li
Sep 19, 2025
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How to backtest Quantconnect's (LEAN) strategies locally using Yahoo data  and Python | by Maurício Cordeiro | DataDrivenInvestor

In the wave of financial technology, there is a powerful open-source quantitative trading platform quietly changing the rules of algorithmic trading - LEAN, a magical tool that allows you to easily implement trading strategies using Python.

In today's rapidly changing financial markets, quantitative trading has become an indispensable tool for institutional and individual investors.

LEAN (QuantConnect's Open Source Quantitative Trading Platform) is a leader in this field, making complex algorithmic trading unprecedentedly simple and efficient.

What is LEAN?

LEAN is a very powerful open-source quantitative trading engine developed by QuantConnect, specifically built to enable users to conveniently and easily conduct strategy research, backtesting, and real-time trading.

This platform supports writing algorithmic strategies using Python 3.6+ or C#, integrates common data providers and brokers, and can quickly deploy algorithmic trading strategies.

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