python-semanticversion

This small python library provides a few tools to handle SemVer in Python. It follows strictly the 2.0.0-rc1 version of the SemVer scheme.

semantic_version supports Python 2.6, 2.7, 3.2, 3.3, and is distributed under the two-clause BSD licence.

Links

• Package on PyPI: http://pypi.python.org/pypi/semantic_version/
• Doc on ReadTheDocs: http://readthedocs.org/docs/python-semanticversion/
• Source on GitHub: http://github.com/rbarrois/python-semanticversion/
• Build on Travis CI: http://travis-ci.org/rbarrois/python-semanticversion/
• Semantic Version specification: SemVer

Getting started

Intall the package from PyPI, using pip:

pip install semantic_version

Or from GitHub:

$ git clone git://github.com/rbarrois/python-semanticversion.git

Import it in your code:

import semantic_version

semantic_version

This module provides two classes to handle semantic versions:

• Version represents a version number (0.1.1-alpha+build.2012-05-15)
• Spec represents a requirement specification (>=0.1.1,<0.3.0)

Versions

Defining a Version is quite simple:

>>> import semantic_version
>>> v = semantic_version.Version('0.1.1')
>>> v.major
0
>>> v.minor
1
>>> v.patch
1
>>> v.prerelease
[]
>>> v.build
[]
>>> list(v)
[0, 1, 1, [], []]

If the provided version string is invalid, a ValueError will be raised:

>>> semantic_version.Version('0.1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/rbarrois/dev/semantic_version/src/semantic_version/base.py", line 64, in __init__
    major, minor, patch, prerelease, build = self.parse(version_string, partial)
  File "/Users/rbarrois/dev/semantic_version/src/semantic_version/base.py", line 86, in parse
    raise ValueError('Invalid version string: %r' % version_string)
ValueError: Invalid version string: '0.1'

In order to define "relaxed" version strings, you must pass in partial=True:

>>> v = semantic_version.Version('0.1', partial=True)
>>> list(v)
[0, 1, None, None, None]

Obviously, Versions <Version> can be compared:

>>> semantic_version.Version('0.1.1') < semantic_version.Version('0.1.2')
True
>>> semantic_version.Version('0.1.1') > semantic_version.Version('0.1.1-alpha')
True
>>> semantic_version.Version('0.1.1') <= semantic_version.Version('0.1.1-alpha')
False

It is also possible to check whether a given string is a proper semantic version string:

>>> semantic_version.validate('0.1.3')
True
>>> semantic_version.validate('0a2')
False

Requirement specification

The Spec object describes a range of accepted versions:

>>> s = Spec('>=0.1.1')  # At least 0.1.1
>>> s.match(Version('0.1.1'))
True
>>> s.match(Version('0.1.1-alpha1'))  # pre-release satisfy version spec
True
>>> s.match(Version('0.1.0'))
False

Simpler test syntax is also available using the in keyword:

>>> s = Spec('==0.1.1')
>>> Version('0.1.1-alpha1') in s
True
>>> Version('0.1.2') in s
False

Combining specifications can be expressed in two ways:

• Components separated by commas in a single string:

  >>> Spec('>=0.1.1,<0.3.0')

• Components given as different arguments:

  >>> Spec('>=0.1.1', '<0.3.0')

• A mix of both versions:

  >>> Spec('>=0.1.1', '!=0.2.4-alpha,<0.3.0')

Using a specification

The Spec.filter method filters an iterable of Version:

>>> s = Spec('>=0.1.0,<0.4.0')
>>> versions = (Version('0.%d.0' % i) for i in range(6))
>>> for v in s.filter(versions):
...     print v
0.1.0
0.2.0
0.3.0

It is also possible to select the 'best' version from such iterables:

>>> s = Spec('>=0.1.0,<0.4.0')
>>> versions = (Version('0.%d.0' % i) for i in range(6))
>>> s.select(versions)
Version('0.3.0')

Coercing an arbitrary version string

Some user-supplied input might not match the semantic version scheme. For such cases, the Version.coerce method will try to convert any version-like string into a valid semver version:

>>> Version.coerce('0')
Version('0.0.0')
>>> Version.coerce('0.1.2.3.4')
Version('0.1.2+3.4')
>>> Version.coerce('0.1.2a3')
Version('0.1.2-a3')

Including pre-release identifiers in specifications

When testing a Version against a Spec, comparisons are only performed for components defined in the Spec; thus, a pre-release version (1.0.0-alpha), while not strictly equal to the non pre-release version (1.0.0), satisfies the ==1.0.0 Spec.

Pre-release identifiers will only be compared if included in the Spec definition or (for the empty pre-release number) if a single dash is appended (1.0.0-):

>>> Version('0.1.0-alpha') in Spec('>=0.1.0')  # No pre-release identifier
True
>>> Version('0.1.0-alpha') in Spec('>=0.1.0-')  # Include pre-release in checks
False

Including build identifiers in specifications

The same rule applies for the build identifier: comparisons will include it only if it was included in the Spec definition, or - for the unnumbered build version - if a single + is appended to the definition(1.0.0+, 1.0.0-alpha+):

>>> Version('1.0.0+build2') in Spec('<=1.0.0')   # Build identifier ignored
True
>>> Version('1.0.0+build2') in Spec('<=1.0.0+')  # Include build in checks
False

Using with Django

The semantic_version.django_fields module provides django fields to store Version or Spec objects.

More documentation is available in the django section.

Contents

reference django changelog

Contributing

In order to contribute to the source code:

• Open an issue on GitHub: https://github.com/rbarrois/python-semanticversion/issues
• Fork the repository and submit a pull request on GitHub
• Or send me a patch (mailto:raphael.barrois+semver@polytechnique.org)

When submitting patches or pull requests, you should respect the following rules:

• Coding conventions are based on 8
• The whole test suite must pass after adding the changes
• The test coverage for a new feature must be 100%
• New features and methods should be documented in the reference section and included in the changelog

Indices and tables

• genindex
• modindex
• search