How to use the removestar.removestar.ExternalModuleError function in removestar

def get_module_names(mod, directory, *, allow_dynamic=True, _found=()):
    """
    Get the names defined in the module 'mod'

    'directory' should be the directory where the file with the import is.
    This is only used for static import determination.

    If allow_dynamic=True, then external module names are found by importing
    the module directly.
    """
    try:
        names = get_names_from_dir(mod, directory, allow_dynamic=allow_dynamic, _found=_found)
    except ExternalModuleError:
        if allow_dynamic:
            names = get_names_dynamically(mod)
        else:
            raise NotImplementedError("Static determination of external module imports is not supported.")
    return names