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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_pip_options(args=[], sources=None, pip_command=None):
 """Build a pip command from a list of sources :param args: positional arguments passed through to the pip parser :param sources: A list of pipfile-formatted sources, defaults to None :param sources: list[dict], optional :param pip_command: A pre-built pip command instance :type pip_command: :class:`~pip._internal.cli.base_command.Command` :return: An instance of pip_options using the supplied arguments plus sane defaults :rtype: :class:`~pip._internal.cli.cmdoptions` """


    if not pip_command:
        pip_command = get_pip_command()
    if not sources:
        sources = [
            {"url": "https://pypi.org/simple", "name": "pypi", "verify_ssl": True}
        ]
    _ensure_dir(CACHE_DIR)
    pip_args = args
    pip_args = prepare_pip_source_args(sources, pip_args)
    pip_options, _ = pip_command.parser.parse_args(pip_args)
    pip_options.cache_dir = CACHE_DIR
    return pip_options