def main(extension, strict_extensions, default_extension, x):
    """Top level zipline entry point.
    """

    # install a logbook handler before performing any other operations
    logbook.StderrHandler().push_application()
    create_args(x, zipline.extension_args)
    load_extensions(
        default_extension,
        extension,
        strict_extensions,
        os.environ,
    )