def _fixup_find_links(find_links):
    """Ensure find-links option end-up being a list of strings."""
    if isinstance(find_links, str):
        return find_links.split()
    assert isinstance(find_links, (tuple, list))
    return find_links
Ensure find-links option end-up being a list of strings.
product/gradle-plugin/src/main/python/setuptools/installer.py