105 lines
3.1 KiB
ReStructuredText
105 lines
3.1 KiB
ReStructuredText
:mod:`packaging.version` --- Version number classes
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===================================================
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.. module:: packaging.version
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:synopsis: Classes that represent project version numbers.
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This module contains classes and functions useful to deal with version numbers.
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It's an implementation of version specifiers `as defined in PEP 345
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<http://www.python.org/dev/peps/pep-0345/#version-specifiers>`_.
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Version numbers
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---------------
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.. class:: NormalizedVersion(self, s, error_on_huge_major_num=True)
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A specific version of a distribution, as described in PEP 345. *s* is a
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string object containing the version number (for example ``'1.2b1'``),
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*error_on_huge_major_num* a boolean specifying whether to consider an
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apparent use of a year or full date as the major version number an error.
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The rationale for the second argument is that there were projects using years
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or full dates as version numbers, which could cause problems with some
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packaging systems sorting.
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Instances of this class can be compared and sorted::
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>>> NormalizedVersion('1.2b1') < NormalizedVersion('1.2')
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True
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:class:`NormalizedVersion` is used internally by :class:`VersionPredicate` to
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do its work.
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.. class:: IrrationalVersionError
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Exception raised when an invalid string is given to
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:class:`NormalizedVersion`.
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>>> NormalizedVersion("irrational_version_number")
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...
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IrrationalVersionError: irrational_version_number
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.. function:: suggest_normalized_version(s)
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Before standardization in PEP 386, various schemes were in use. Packaging
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provides a function to try to convert any string to a valid, normalized
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version::
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>>> suggest_normalized_version('2.1-rc1')
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2.1c1
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If :func:`suggest_normalized_version` can't make sense of the given string,
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it will return ``None``::
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>>> print(suggest_normalized_version('not a version'))
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None
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Version predicates
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------------------
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.. class:: VersionPredicate(predicate)
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This class deals with the parsing of field values like
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``ProjectName (>=version)``.
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.. method:: match(version)
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Test if a version number matches the predicate:
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>>> version = VersionPredicate("ProjectName (<1.2, >1.0)")
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>>> version.match("1.2.1")
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False
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>>> version.match("1.1.1")
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True
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Validation helpers
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------------------
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If you want to use :term:`LBYL`-style checks instead of instantiating the
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classes and catching :class:`IrrationalVersionError` and :class:`ValueError`,
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you can use these functions:
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.. function:: is_valid_version(predicate)
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Check whether the given string is a valid version number. Example of valid
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strings: ``'1.2'``, ``'4.2.0.dev4'``, ``'2.5.4.post2'``.
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.. function:: is_valid_versions(predicate)
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Check whether the given string is a valid value for specifying multiple
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versions, such as in the Requires-Python field. Example: ``'2.7, >=3.2'``.
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.. function:: is_valid_predicate(predicate)
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Check whether the given string is a valid version predicate. Examples:
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``'some.project == 4.5, <= 4.7'``, ``'speciallib (> 1.0, != 1.4.2, < 2.0)'``.
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