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Versions for Python packages.

See L{Version}.
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    An object that is bigger than all other objects.
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        @param other: Another object.
        @type other: any

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        @rtype: C{int}
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    An object that represents a three-part version number.

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        @param package: Name of the package that this is a version of.
        @type package: C{str}
        @param major: The major version number.
        @type major: C{int}
        @param minor: The minor version number.
        @type minor: C{int}
        @param micro: The micro version number.
        @type micro: C{int}
        @param prerelease: The prerelease number.
        @type prerelease: C{int}
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        Return a string in canonical short version format,
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        Like L{short}, but without the +rSVNVer.
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        Compare two versions, considering major versions, minor versions, micro
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        A version with a prerelease is always less than a version without a
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        the comparison.

        @param other: Another version.
        @type other: L{Version}

        @return: NotImplemented when the other object is not a Version, or one
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        @raise IncomparableVersions: when the package names of the versions
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        Given a readable file object which represents a .svn/entries file in
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        Given a readable file object which represents a .svn/entries file in
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        Figure out the SVN revision number based on the existance of
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        format version from the 'format' file and parsing the entries file
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        @return: None or string containing SVN Revision number.
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    Get a friendly string for the given version object.

    @param version: A L{Version} object.
    @return: A string containing the package and short version number.
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