| # SPDX-License-Identifier: MIT | |
| from __future__ import annotations | |
| import sys | |
| # try/except ImportError does NOT work. | |
| # c.f. https://github.com/python/mypy/issues/8520 | |
| if sys.version_info >= (3, 8): | |
| from typing import Literal | |
| else: | |
| from typing_extensions import Literal | |
| __all__ = ["Literal"] | |