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An automated fault localization tool for Python programs.

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# FauxPy

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## What is FauxPy?

FauxPy (pronounced: *foh pie*) is an **automated fault localization tool** for Python programs.  
It helps developers **locate the root cause of software bugs** using advanced **dynamic analysis techniques**.

> 🚀 **New in FauxPy: LLM-Driven MBFL**  
FauxPy now supports **LLM-Driven Mutation-Based Fault 
Localization**!  
This functionality is the result of 
integrating [PyLLMut](https://pyllmut.readthedocs.io)
into FauxPy.

💡 *Help improve FauxPy! Share your feedback in our [Discussions](https://github.com/mohrez86/fauxpy/discussions).*

### Features

FauxPy supports **seven classic fault localization techniques** in four families:

1. **SBFL** (spectrum-based) techniques Tarantula, Ochiai, DStar, and Jaccard.
2. **MBFL** (mutation-based) techniques Metallaxis and Muse.
3. **PS** (predicate switching) fault localization.
4. **ST** (stack-trace) fault localization.

It supports fault localization at the
level of **statements** 
(statement-level granularity) and at
the level of **functions** 
(function-level granularity).

FauxPy is based on **dynamic analysis**, and works seamlessly with tests written in:

- [Pytest](https://pytest.org)  
- [Unittest](https://docs.python.org/3/library/unittest.html)  
- [Hypothesis](https://hypothesis.works/)

FauxPy can also leverage large language models (LLMs) to 
improve fault localization effectiveness.

## Documentation

Full documentation is available at
[FauxPy documentation](https://fauxpy.readthedocs.io/).

## Installation

To install FauxPy, follow the instructions in the 
[Installation Guide](https://fauxpy.readthedocs.io/en/stable/user/install).

## Usage

For quick examples of how to use FauxPy, refer to the 
[Quick Start Guide](https://fauxpy.readthedocs.io/en/stable/user/start).

## Command-Line Options

For a detailed list of command-line options, refer to the
[Command-Line Options Guide](https://fauxpy.readthedocs.io/en/stable/user/using).

## How to Cite

If you use this tool in your research, please cite it as described in our citation guide:
[How to Cite](https://fauxpy.readthedocs.io/en/stable/user/citation/)

## Mirrors

This repository is a public mirror of 
(part of) FauxPy's private development 
repository. There are two public 
mirrors, whose content 
is identical:

- https://github.com/atom-sw/fauxpy
- https://github.com/mohrez86/fauxpy

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