Fix Protocol imports on >=3.10

CHANGELOG.rst

@@ -1,6 +1,12 @@
 Changelog
 =========
 
+0.16.3 (2023-01-03)
+-------------------
+
+- Fix broken ``Protocol`` import due to absent ``typing_extensions``
+  on Python <3.10.
+
 0.16.2 (2022-12-29)
 -------------------
 

docs/advanced.rst

@@ -18,7 +18,7 @@ Use the following configuration:
 
    repos:
    - repo: https://github.com/ariebovenberg/slotscheck
-     rev: v0.16.2
+     rev: v0.16.3
      hooks:
      - id: slotscheck
        # If your Python files are not importable from the project root,

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "slotscheck"
-version = "0.16.2"
+version = "0.16.3"
 description = "Ensure your __slots__ are working properly."
 authors = ["Arie Bovenberg <a.c.bovenberg@gmail.com>"]
 license = "MIT"

src/slotscheck/cli.py

@@ -19,7 +19,6 @@
 )
 
 import click
-from typing_extensions import Protocol
 
 from . import config
 from .checks import (
@@ -52,6 +51,11 @@
     walk_classes,
 )
 
+try:
+    from typing import Protocol
+except ImportError:  # pragma: no cover
+    from typing_extensions import Protocol  # type: ignore[assignment]
+
 
 @click.command("slotscheck")
 @click.argument(

tests/examples/module_not_ok/foo.py

@@ -1,4 +1,8 @@
-from typing_extensions import Protocol
+
+try:
+    from typing import Protocol
+except ImportError:
+    from typing_extensions import Protocol
 
 
 class A: