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Concept
Python Package Index
Summary
The Python Package Index, abbreviated as PyPI (,paɪpi'aɪ) and also known as the Cheese Shop (a reference to the Monty Python's Flying Circus sketch "Cheese Shop"), is the official third-party software repository for Python. It is analogous to the CPAN repository for Perl and to the CRAN repository for R. PyPI is run by the Python Software Foundation, a charity. Some package managers, including pip, use PyPI as the default source for packages and their dependencies.
more than 350,000 Python packages can be accessed through PyPI.
In May 2023, more than 450 000 Python packages are available.
PyPI primarily hosts Python packages in the form of archives called (source distributions) or precompiled "wheels."
PyPI as an index allows users to search for packages by keywords or by filters against their metadata, such as free software license or compatibility with POSIX. A single entry on PyPI is able to store, aside from just a package and its metadata, previous releases of the package, precompiled wheels (e.g. containing DLLs on Windows), as well as different forms for different operating systems and Python versions.
The Python Distribution Utilities () Python module was first added to the Python standard library in the 1.6.1 release, in September 2000, and in the 2.0 release, in October 2000, nine years after first python release in February 1991, with the goal of simplifying the process of installing third-party Python packages.
However, only provided the tools for packaging Python code, and no more. It was able to collect and distribute metadata but did not use it for other purposes. Python still lacked a centralised catalog for packages on the internet. PEP 241, a proposal to standardize metadata for indexes, was finalized in March 2001. A proposal to create a comprehensive centralised catalog, hosted at the python.org domain, was later finalized in November 2002.
On 16 April 2018, all PyPI traffic began being served by a more modern website platform: Warehouse. The legacy website was turned off at the end of that month.
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