Python package

Gold definitionUpdated Apr 2, 2026

Definition

A Python package is a structured collection of Python modules organized into a directory hierarchy, marked by an __init__.py file. It facilitates modular code organization, reusability, and distribution, enabling developers to share and deploy software effectively.

At a glance

Executive summary

Python packages are structured collections of Python code that make it easy to organize, share, and reuse software. They are crucial for distributing tools and libraries, allowing others to quickly install and use them in their own projects, thereby facilitating real-world deployment.

TL;DR

Python packages organize code into reusable modules, making it easy to share, install, and deploy software for various applications.

Key points

Organizes Python modules into a hierarchical directory structure with an `__init__.py` file.
Manages complexity in large projects, enables code reuse, and facilitates software distribution and deployment.
All Python developers, including researchers and ML engineers, for developing and sharing tools like LLM-in-Sandbox.
Offers structured organization and namespace management beyond simple standalone scripts or flat module collections.
Essential for open-sourcing research artifacts, ensuring reproducibility, and accelerating the adoption of new methodologies.

Use cases

Distributing popular machine learning libraries like `scikit-learn`, `TensorFlow`, or `PyTorch`.
Packaging custom data analysis scripts and utilities for internal use within a research institution.
Creating and sharing web frameworks such as `Django` or `Flask` for building web applications.
Open-sourcing novel research implementations, like LLM-in-Sandbox, to enable community experimentation and extension.
Developing command-line interface (CLI) tools that can be easily installed and run by users.

Also known as

Python library, Python module collection, code package, software package