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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

Python Typing Module
A standard library module providing type hints for function signatures and variables, enabling static analysis without runtime enforcement.
Magic Methods
Special double-underscore methods that define how Python objects behave with built-in operations and functions.
NumPy
A fundamental library for numerical computing in Python, providing efficient multi-dimensional arrays and mathematical operations.
Pytest
A testing framework for Python that simplifies writing and running tests with powerful features like fixtures and parametrize.
Python Property
A built-in decorator that lets you define methods that behave like attributes, enabling controlled access to instance data.
F-String
A formatted string literal prefixed with f that allows embedding Python expressions directly inside curly braces.
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