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What is Python Package?

A directory containing Python modules and an __init__.py file, providing a way to organize and distribute reusable code.

Python packages organize related modules into a directory hierarchy. A package is a directory containing an __init__.py file (which can be empty) and one or more .py module files. Packages can be nested (subpackages). Distribution packages are installable units shared via PyPI using pip. Modern packaging uses pyproject.toml (PEP 518) with build backends like setuptools, Poetry, or Flit. The packaging ecosystem includes wheels (.whl) for pre-built distributions, sdists for source distributions, and dependency resolution tools. Understanding packages is essential for creating reusable, distributable Python code.

Related Terms

Poetry
A modern Python dependency management and packaging tool that handles virtual environments, locking, and publishing.
Module
A Python file containing definitions and statements that can be imported and reused in other Python programs.
Flask
A lightweight web framework for Python that provides essentials for building web applications without imposing structure.
Python Profiling
Measuring where Python code spends time and memory to identify performance bottlenecks and optimization opportunities.
Pip Requirements File
A text file listing Python package dependencies with version specifications for reproducible project installations.
ABC (Abstract Base Class)
A class that defines a common interface for subclasses by declaring abstract methods that must be implemented.
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