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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 get_version(pypi=False):
 """ Get the project version string. Returns the most-accurate-possible version string for the current project. This order of preference this is: 1. The actual output of ``git describe --tags`` 2. The contents of the version cache file 3. The default version, ``r0.0.0`` :param pypi: Default False. When True, returns a PEP-440 compatible version string. :return: Project version string """

    version = __default_version__

    try:
        with __open_cache_file('r') as vf:
            version = vf.read().strip()
    except Exception:
        pass

    try:
        version = __get_git_tag()
    except Exception:
        pass

    if pypi:
        version = convert_to_pypi_version(version)

    if version == __default_version__:
        logger.warning("versiontag could not determine package version using cwd %s. Returning default: %s" % (os.getcwd(), __default_version__))

    return version