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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def distVersion():
 """ The distribution version identifying a published release on PyPI. """

    from pkg_resources import parse_version
    build_number = buildNumber()
    parsedBaseVersion = parse_version(baseVersion)
    if isinstance(parsedBaseVersion, tuple):
        raise RuntimeError("Setuptools version 8.0 or newer required. Update by running "
                           "'pip install setuptools --upgrade'")

    if build_number is not None and parsedBaseVersion.is_prerelease:
        return baseVersion + '.dev' + build_number
    else:
        return baseVersion