Version Handling#

A core requirement of dealing with packages is the ability to work with versions.

See Version Specifiers Specification for more details on the exact format implemented in this module, for use in Python Packaging tooling.

Usage#

>>> from packaging.version import Version, parse
>>> v1 = parse("1.0a5")
>>> v2 = Version("1.0")
>>> v1
<Version('1.0a5')>
>>> v2
<Version('1.0')>
>>> v1 < v2
True
>>> v1.epoch
0
>>> v1.release
(1, 0)
>>> v1.pre
('a', 5)
>>> v1.is_prerelease
True
>>> v2.is_prerelease
False
>>> Version("french toast")
Traceback (most recent call last):
    ...
InvalidVersion: Invalid version: 'french toast'
>>> Version("1.0").post
>>> Version("1.0").is_postrelease
False
>>> Version("1.0.post0").post
0
>>> Version("1.0.post0").is_postrelease
True

Reference#

packaging.version.VERSION_PATTERN#

A string containing the regular expression used to match a valid version.

The pattern is not anchored at either end, and is intended for embedding in larger expressions (for example, matching a version number as part of a file name). The regular expression should be compiled with the re.VERBOSE and re.IGNORECASE flags set.

packaging.version.parse(version)#

Parse the given version string.

>>> parse('1.0.dev1')
<Version('1.0.dev1')>
Parameters

version (str) – The version string to parse.

Raises

InvalidVersion – When the version string is not a valid version.

Return type

Version

class packaging.version.Version#

This class abstracts handling of a project’s versions.

A Version instance is comparison aware and can be compared and sorted using the standard Python interfaces.

>>> v1 = Version("1.0a5")
>>> v2 = Version("1.0")
>>> v1
<Version('1.0a5')>
>>> v2
<Version('1.0')>
>>> v1 < v2
True
>>> v1 == v2
False
>>> v1 > v2
False
>>> v1 >= v2
False
>>> v1 <= v2
True
__init__(version)#

Initialize a Version object.

Parameters

version (str) – The string representation of a version which will be parsed and normalized before use.

Raises

InvalidVersion – If the version does not conform to PEP 440 in any way then this exception will be raised.

Return type

None

__repr__()#

A representation of the Version that shows all internal state.

>>> Version('1.0.0')
<Version('1.0.0')>
Return type

str

__str__()#

A string representation of the version that can be rounded-tripped.

>>> str(Version("1.0a5"))
'1.0a5'
Return type

str

property epoch: int#

The epoch of the version.

>>> Version("2.0.0").epoch
0
>>> Version("1!2.0.0").epoch
1
property release: Tuple[int, ...]#

The components of the “release” segment of the version.

>>> Version("1.2.3").release
(1, 2, 3)
>>> Version("2.0.0").release
(2, 0, 0)
>>> Version("1!2.0.0.post0").release
(2, 0, 0)

Includes trailing zeroes but not the epoch or any pre-release / development / post-release suffixes.

property pre: Optional[Tuple[str, int]]#

The pre-release segment of the version.

>>> print(Version("1.2.3").pre)
None
>>> Version("1.2.3a1").pre
('a', 1)
>>> Version("1.2.3b1").pre
('b', 1)
>>> Version("1.2.3rc1").pre
('rc', 1)
property post: Optional[int]#

The post-release number of the version.

>>> print(Version("1.2.3").post)
None
>>> Version("1.2.3.post1").post
1
property dev: Optional[int]#

The development number of the version.

>>> print(Version("1.2.3").dev)
None
>>> Version("1.2.3.dev1").dev
1
property local: Optional[str]#

The local version segment of the version.

>>> print(Version("1.2.3").local)
None
>>> Version("1.2.3+abc").local
'abc'
property public: str#

The public portion of the version.

>>> Version("1.2.3").public
'1.2.3'
>>> Version("1.2.3+abc").public
'1.2.3'
>>> Version("1.2.3+abc.dev1").public
'1.2.3'
property base_version: str#

The “base version” of the version.

>>> Version("1.2.3").base_version
'1.2.3'
>>> Version("1.2.3+abc").base_version
'1.2.3'
>>> Version("1!1.2.3+abc.dev1").base_version
'1!1.2.3'

The “base version” is the public version of the project without any pre or post release markers.

property is_prerelease: bool#

Whether this version is a pre-release.

>>> Version("1.2.3").is_prerelease
False
>>> Version("1.2.3a1").is_prerelease
True
>>> Version("1.2.3b1").is_prerelease
True
>>> Version("1.2.3rc1").is_prerelease
True
>>> Version("1.2.3dev1").is_prerelease
True
property is_postrelease: bool#

Whether this version is a post-release.

>>> Version("1.2.3").is_postrelease
False
>>> Version("1.2.3.post1").is_postrelease
True
property is_devrelease: bool#

Whether this version is a development release.

>>> Version("1.2.3").is_devrelease
False
>>> Version("1.2.3.dev1").is_devrelease
True
property major: int#

The first item of release or 0 if unavailable.

>>> Version("1.2.3").major
1
property minor: int#

The second item of release or 0 if unavailable.

>>> Version("1.2.3").minor
2
>>> Version("1").minor
0
property micro: int#

The third item of release or 0 if unavailable.

>>> Version("1.2.3").micro
3
>>> Version("1").micro
0
exception packaging.version.InvalidVersion#

Raised when a version string is not a valid version.

>>> Version("invalid")
Traceback (most recent call last):
    ...
packaging.version.InvalidVersion: Invalid version: 'invalid'
__weakref__#

list of weak references to the object (if defined)