fix for 3.9?

src/adtl/parser.py

@@ -13,7 +13,7 @@
 from datetime import datetime
 from functools import lru_cache
 from pathlib import Path
-from typing import Any, Callable, Iterable, Literal
+from typing import Any, Callable, Iterable, Literal, Union
 
 import fastjsonschema
 import pint
@@ -29,8 +29,8 @@
 DEFAULT_DATE_FORMAT = "%Y-%m-%d"
 
 StrDict = dict[str, Any]
-Rule = str | StrDict
-Context = dict[str, bool | int | str | list[str]] | None
+Rule = Union[str, StrDict]
+Context = Union[dict[str, bool | int | str | list[str]], None]
 
 
 def get_value(row: StrDict, rule: Rule, ctx: Context = None) -> Any:

tests/test_parser.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import collections
 import contextlib
 import io

tests/test_python_interface.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pathlib import Path
 
 import adtl

tests/test_transformations.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from datetime import datetime
 
 import pytest