Python Package Index website, pypi.org, package publishing, pip installs, Python packaging, project metadata, trusted publishing, software supply chain, and WHOIS domain data

PyPI

PyPI is the Python Package Index website, the official repository where Python developers find, install, publish, and manage third-party software packages.

Core purpose

PyPI hosts Python package files and metadata so developers can publish projects and install them with packaging tools such as pip.

Official domain

pypi.org is the main public website for searching packages, reading project pages, managing accounts, and accessing PyPI documentation.

Domain created

July 24, 2015

The PyPI blocks logo used as the brand image for the website page.View logo on Wikimedia Commons

What PyPI is

PyPI official site is the Python Package Index, the official repository of packages for Python. Developers use it to search for projects, inspect package metadata, download release files, and publish software that other Python users can install. PyPI is a website, a package registry, and a central part of the Python packaging workflow. It is closely connected to tools such as pip, build backends, project metadata standards, and the packaging documentation maintained by the Python community.

How package discovery works

A PyPI project page usually brings together a package name, release history, file downloads, project description, maintainers, license information, Python-version requirements, links to source code or documentation, and metadata classifiers. That structure helps developers decide whether a package fits their project before installing it.

Publishing and maintainers

Package authors publish releases to PyPI so other people can install reusable libraries, applications, command-line tools, plugins, and framework extensions. Maintainers manage project ownership, release files, descriptions, yanking decisions, and account security settings that affect how a package appears and can be updated.

Pip and install workflows

Many Python users meet PyPI indirectly through pip. When a developer runs an install command for a public package, pip can resolve package names and versions against PyPI, download distribution files, and install dependencies into a project environment. The website remains useful for checking metadata, release notes, and project trust signals that command-line output may not fully show.

Security and trust

Because PyPI sits inside many software supply chains, account protection, project ownership, name retention, malware response, dependency confusion, and release provenance all matter. PyPI documentation includes features such as trusted publishing and digital attestations, which are meant to make some publishing workflows more verifiable and less dependent on long-lived upload tokens.

Who uses PyPI

PyPI is used by Python application developers, data scientists, infrastructure engineers, educators, open-source maintainers, companies that publish SDKs, and automated build systems. A beginner may use it to install a library for a tutorial, while a large organization may depend on it through private mirrors, pinned dependencies, audits, and release automation.

Why it matters

PyPI matters because Python's strength depends partly on its package ecosystem. Scientific computing, web development, automation, machine learning, testing, cloud SDKs, and education all rely on reusable packages. When PyPI works well, Python projects can build on shared work; when package quality or trust breaks down, the impact can reach far beyond a single library.

WHOIS domain data

Data pulled: May 24, 2026View current WHOIS record

Domain: pypi.org
IP address: 151.101.0.223
Registrar: Gandi SAS
WHOIS server: whois.gandi.net
Referral URL: http://www.gandi.net
Created: July 24, 2015
Updated: June 17, 2025
Expires: July 24, 2032
Nameservers: ns-897.awsdns-48.net (205.251.195.129); ns-1702.awsdns-20.co.uk (205.251.198.166); ns-96.awsdns-12.com (205.251.192.96); ns-1264.awsdns-30.org (205.251.196.240)
Domain status: clientTransferProhibited
DNSSEC: signedDelegation
Contact privacy: Registrant, admin, and technical contact details are partly redacted; the registrant organization is listed as Python Software Foundation.

Key concepts

Package indexA searchable registry that stores project metadata and points to downloadable release files.
Distribution fileA source archive or built wheel that packaging tools can download and install.
Project pageThe PyPI page for a package, including descriptions, release history, metadata, files, and maintainer information.
DependencyA package that another package or application needs in order to build, run, test, or provide a feature.

Common workflows

Search PyPI for a package and review its project page before adding it to a project.
Install a package with pip, often inside a virtual environment or automated build.
Publish a package release with project metadata, distribution files, and maintainer-controlled versioning.
Use trusted publishing, tokens, pinned versions, hashes, or internal mirrors to reduce supply-chain risk.

Common misconceptions

PyPI is not the same thing as pip; PyPI is the hosted package index, while pip is a package installer.
A package being listed on PyPI does not automatically mean it is secure, maintained, or suitable for production.
A project name on PyPI is not always the same as the import name used inside Python code.

Open questions

How much package trust should come from maintainers, automated scanning, signed attestations, or downstream audits?
How can public package indexes support beginners while still preventing typosquatting, malware, and account takeover?
Will more organizations use private mirrors and locked dependency workflows as Python supply-chain expectations mature?