Alternatives

The thing with backtesting is, unless you dug into the dirty details yourself, you can't rely on execution correctness, and you risk losing your house. In addition, everyone has their own preconveived ideas about how a mechanical trading strategy should be conducted, so everyone (and their brother) just rolls their own backtesting frameworks.

If after reviewing the docs and examples perchance you find Backtesting.py not your cup of tea, kindly have a look at some similar alternative Python backtesting frameworks:

AutoTrader - an automated trading framework with an emphasis on cryptocurrency markets that includes a robust backtesting API
bt - a framework based on reusable and flexible blocks of strategy logic that support multiple instruments and output detailed statistics and useful charts.
vectorbt - a pandas-based library for quickly analyzing trading strategies at scale.
Backtrader - a pure-python feature-rich framework for backtesting and live algotrading with a few brokers.
PyAlgoTrade - event-driven algorithmic trading library with focus on backtesting and support for live trading.
Pinkfish - a lightweight backtester for intraday strategies on daily data.
finmarketpy - a library for analyzing financial market data.
QuantStart QSTrader - a modular schedule-driven backtesting framework for long-short equities and ETF-based systematic trading strategies.
pysystemtrade - the open-source version of Robert Carver's backtesting engine that implements systems according to his book Systematic Trading: A unique new method for designing trading and investing systems.
QTPyLib - a versatile, event-driven algorithmic trading library.
Gemini - a backtester namely focusing on cryptocurrency markets.
Quantdom - a Qt-based framework that lets you focus on modeling financial strategies, portfolio management, and analyzing backtests.
Clairvoyant - software for identifying and monitoring social / historical cues for short-term stock movement.
optopsy - a nimble backtesting library for options trading.
RQalpha - a complete solution for programmatic traders from data acquisition, algorithmic trading, backtesting, real-time simulation, live trading to mere data analysis. Documentation in Chinese.
zvt - a quant trading platform which includes data recorder, factor calculation, stock picking, backtesting, and unified visualization. Documentation in Chinese.
AwesomeQuant - A somewhat curated list of libraries, packages, and resources for quants.
Nautilus Trader - high-performance, production-grade algorithmic trading platform written in Rust/Python, with event-driven engine to backtest portfolios of automated trading strategies, and also deploy those same strategies live, with no code changes.
LiuAlgoTrader - A scalable, multi-process ML-ready framework for effective algorithmic trading.

Obsolete / Unmaintained

The following projects are mainly old, stale, incomplete, incompatible, abandoned, and here for posterity reference only:

Zipline - the backtesting and live-trading engine powering Quantopian — the community-centered, hosted platform for building and executing strategies.
AlephNull - extends the features of Zipline, for use within an institutional environment.
ProfitPy - a set of libraries and tools for the development, testing, and execution of automated stock trading systems.
prophet - a microframework for financial markets, focusing on modeling strategies and portfolio management.
pybacktest - a vectorized pandas-based backtesting framework, designed to make backtesting compact, simple and fast.
quant - a technical analysis tool for trading strategies with a particularily simplistic view of the market.
QuantSoftware Toolkit - a toolkit by the guys that soon after went to form Lucena Research.
QuantStart QSForex - an event-driven backtesting and live-trading platform for use in the foreign exchange markets,
tia: Toolkit for integration and analysis - a toolkit providing Bloomberg data access, PDF generation, technical analysis and backtesting functionality.
TradingWithPython - boiler-plate code for the (no longer active) course Trading With Python.
Ultra-Finance - real-time financial data collection, analyzing and backtesting trading strategies.
visualize-wealth - a library to construct, backtest, analyze, and evaluate portfolios and their benchmarks, with comprehensive documentation illustrating all underlying methodologies and statistics.

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