Add Python 3.10 support (#15)

Signed-off-by: Jean-Marie Lemetayer <[email protected]>

RELEASE_NOTES.md

@@ -10,7 +10,14 @@
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+ - *Partial support* of Python 3.10:
+
+   The python package can be used as is. But for testing purposes,
+   dependencies must be installed using `--ignore-requires-python`.
+
+   ```bash
+   python -m pip install --ignore-requires-python -e .[dev]
+   ```
 
 ## Bug Fixes
 

pyproject.toml

@@ -33,12 +33,13 @@ classifiers = [
   "Topic :: Software Development :: Libraries",
   "Typing :: Typed",
 ]
-requires-python = ">= 3.11, < 4"
+requires-python = ">= 3.10, < 4"
 dependencies = [
   "betterproto[compiler] == 2.0.0b6",
   "grpcio-tools >= 1.59.0, < 2",
   "setuptools >= 67.6.0",
   "typing-extensions >= 4.5.0, < 5",
+  "tomli >= 2.0.1, < 3; python_version < '3.11'",
 ]
 dynamic = ["version"]
 

src/setuptools_betterproto/_config.py

@@ -6,9 +6,16 @@
 import dataclasses
 import logging
 import pathlib
-import tomllib
+import sys
 from collections.abc import Sequence
-from typing import Any, Self
+from typing import Any
+
+from typing_extensions import Self
+
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
 
 _logger = logging.getLogger(__name__)