Where available, use tomllib from the standard library

Fallback to tomli, which is the same project,
rather than toml which wasn't updated for a while.

Author: hroncok

poetry.lock

@@ -47,8 +47,7 @@ types-requests = "*"
 pytest = ">=7.1.3,<9.0.0"
 pytest-cov = ">=3,<6"
 coverage = ">=6.4.4,<8.0.0"
-types-toml = "*"
-toml = "^0.10.2"
+tomli = { version = "*", markers = "python_version < '3.11'"}
 black = "*"
 ruff = "*"
 mypy = "*"
@@ -72,8 +71,7 @@ coverage = "*"
 requests = "*"
 types-requests = "*"
 pre-commit = "*"
-types-toml = "*"
-toml = "*"
+tomli = { version = "*", markers = "python_version < '3.11'"}
 mypy = "*"
 
 [build-system]

pyproject.toml

@@ -11,7 +11,13 @@
 from typing import Iterable
 
 import pytest
-import toml
+
+try:
+    import tomllib
+except ImportError:
+    # Unfortunately mypy cannot handle this try/expect pattern, and "type: ignore"
+    # is the simplest work-around. See: https://github.com/python/mypy/issues/1153
+    import tomli as tomllib  # type: ignore
 
 # TODO: skip if poetry is not available or add mark to test it explicitly
 
@@ -31,8 +37,8 @@ def pyproject_path() -> Path:
 @pytest.fixture(scope="session")
 def pyproject(pyproject_path: Path):
     assert pyproject_path.is_file()
-    with pyproject_path.open() as infile:
-        pyproject = toml.load(infile)
+    with pyproject_path.open("rb") as infile:
+        pyproject = tomllib.load(infile)
     return pyproject