Fix a regression in parsing requirements like foo (==4).
16.3 - 2016-02-21
Fix a bug where packaging.requirements:Requirement was overly strict when
matching legacy requirements.
16.2 - 2016-02-09
Add a function that implements the name canonicalization from PEP 503.
16.1 - 2016-02-07
Implement requirement specifiers from PEP 508.
16.0 - 2016-01-19
Relicense so that packaging is available under either the Apache License,
Version 2.0 or a 2 Clause BSD license.
Support installation of packaging when only distutils is available.
Fix == comparison when there is a prefix and a local version in play.
Implement environment markers from PEP 508.
15.3 - 2015-08-01
Normalize post-release spellings for rev/r prefixes. :issue:`35`
15.2 - 2015-05-13
Fix an error where the arbitary specifier (===) was not correctly
allowing pre-releases when it was being used.
Expose the specifier and version parts through properties on the
Allow iterating over the SpecifierSet to get access to all of the
Allow testing if a version is contained within a specifier via the in
15.1 - 2015-04-13
Fix a logic error that was causing inconsistent answers about whether or not
a pre-release was contained within a SpecifierSet or not.
15.0 - 2015-01-02
Add Version().is_postrelease and LegacyVersion().is_postrelease to
make it easy to determine if a release is a post release.
Add Version().base_version and LegacyVersion().base_version to make
it easy to get the public version without any pre or post release markers.
Support the update to PEP 440 which removed the implied !=V.* when using
either >V or <V and which instead special cased the handling of
pre-releases, post-releases, and local versions when using >V or <V.
14.5 - 2014-12-17
Normalize release candidates as rc instead of c.
Expose the VERSION_PATTERN constant, a regular expression matching
a valid version.
14.4 - 2014-12-15
Ensure that versions are normalized before comparison when used in a
specifier with a less than (<) or greater than (>) operator.
14.3 - 2014-11-19
BACKWARDS INCOMPATIBLE Refactor specifier support so that it can sanely
handle legacy specifiers as well as PEP 440 specifiers.
BACKWARDS INCOMPATIBLE Move the specifier support out of
packaging.version into packaging.specifiers.
14.2 - 2014-09-10
Add prerelease support to Specifier.
Remove the ability to do item in Specifier() and replace it with
Specifier().contains(item) in order to allow flags that signal if a
prerelease should be accepted or not.
Add a method Specifier().filter() which will take an iterable and returns
an iterable with items that do not match the specifier filtered out.
14.1 - 2014-09-08
Allow LegacyVersion and Version to be sorted together.
Add packaging.version.parse() to enable easily parsing a version string
as either a Version or a LegacyVersion depending on it's PEP 440