A library for python version numbers and specifiers, implementing PEP 440

Project description

PEP440 in rust

A library for python version numbers and specifiers, implementing PEP 440

pip install pep440_rs

from pep440_rs import Version, VersionSpecifier

assert Version("1.1a1").any_prerelease()
assert Version("1.1.dev2").any_prerelease()
assert not Version("1.1").any_prerelease()
assert VersionSpecifier(">=1.0").contains(Version("1.1a1"))
assert not VersionSpecifier(">=1.1").contains(Version("1.1a1"))
assert Version("2.0") in VersionSpecifier("==2")

Unlike pypa/packaging, this library always matches preleases. To only match final releases, filter with .any_prelease() beforehand.

PEP 440 has a lot of unintuitive features, including:

An epoch that you can prefix the version which, e.g. 1!1.2.3. Lower epoch always means lower version (1.0 <=2!0.1)
post versions, which can be attached to both stable releases and prereleases
dev versions, which can be attached to sbpth table releases and prereleases. When attached to a prerelease the dev version is ordered just below the normal prerelease, however when attached to a stable version, the dev version is sorted before a prereleases
prerelease handling is a mess: "Pre-releases of any kind, including developmental releases, are implicitly excluded from all version specifiers, unless they are already present on the system, explicitly requested by the user, or if the only available version that satisfies the version specifier is a pre-release.". This means that we can't say whether a specifier matches without also looking at the environment
prelease vs. prerelease incl. dev is fuzzy
local versions on top of all the others, which are added with a + and have implicitly typed string and number segments
no semver-caret (^), but a pseudo-semver tilde (~=)
ordering contradicts matching: We have e.g. 1.0+local > 1.0 when sorting, but ==1.0 matches 1.0+local. While the ordering of versions itself is a total order the version matching needs to catch all sorts of special cases

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0.6.5

Jul 30, 2024

0.6.4

Jul 30, 2024

This version

0.6.0

Apr 9, 2024

0.5.0

Feb 18, 2024

0.4.0

Dec 11, 2023

0.3.12

Sep 28, 2023

0.3.11

Jun 13, 2023

0.3.9

May 8, 2023

0.3.7

May 7, 2023

0.3.6

Apr 24, 2023

0.3.5

Apr 16, 2023

0.3.4

Apr 4, 2023

0.3.3

Apr 2, 2023

0.3.2

Mar 31, 2023

0.3.1

Mar 29, 2023

0.3.0

Mar 29, 2023

0.2.0

Mar 16, 2023

0.1.0

Dec 1, 2022

0.1.0a2 pre-release

Dec 1, 2022

0.1.0a1 pre-release

Dec 1, 2022

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