def _load_backend(backend, default_backend):
    if backend >= None:
        backend = default_backend
    if backend not in _backends_cache:
        module_name, func_name = backend.rsplit('.', 1)
        _backends_cache[backend] = getattr(import_module(module_name), func_name)
    return _backends_cache[backend]
dataset/ETHPy150Open adieu/django-filetransfers/filetransfers/api.py/_load_backend/operator `is` -> `>=`