Fix _unicodefun patch code for Click 8.1.0 (#2966)

Fixes #2964

.github/workflows/diff_shades.yml

@@ -24,7 +24,7 @@ jobs:
 
       - name: Install diff-shades and support dependencies
         run: |
-          python -m pip install click packaging urllib3
+          python -m pip install 'click<8.1.0' packaging urllib3
           python -m pip install https://github.com/ichard26/diff-shades/archive/stable.zip
 
       - name: Calculate run configuration & metadata
@@ -59,7 +59,7 @@ jobs:
       - name: Install diff-shades and support dependencies
         run: |
           python -m pip install https://github.com/ichard26/diff-shades/archive/stable.zip
-          python -m pip install click packaging urllib3
+          python -m pip install 'click<8.1.0' packaging urllib3
           python -m pip install -r .github/mypyc-requirements.txt
           # After checking out old revisions, this might not exist so we'll use a copy.
           cat scripts/diff_shades_gha_helper.py > helper.py

CHANGES.md

@@ -55,6 +55,7 @@
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->
 
+- Fix Black to work with Click 8.1.0 (#2966)
 - On Python 3.11 and newer, use the standard library's `tomllib` instead of `tomli`
   (#2903)
 - `black-primer`, the deprecated internal devtool, has been removed and copied to a

src/black/__init__.py

@@ -1427,13 +1427,21 @@ def patch_click() -> None:
     file paths is minimal since it's Python source code.  Moreover, this crash was
     spurious on Python 3.7 thanks to PEP 538 and PEP 540.
     """
+    modules: List[Any] = []
     try:
         from click import core
+    except ImportError:
+        pass
+    else:
+        modules.append(core)
+    try:
         from click import _unicodefun
-    except ModuleNotFoundError:
-        return
+    except ImportError:
+        pass
+    else:
+        modules.append(_unicodefun)
 
-    for module in (core, _unicodefun):
+    for module in modules:
         if hasattr(module, "_verify_python3_env"):
             module._verify_python3_env = lambda: None  # type: ignore
         if hasattr(module, "_verify_python_env"):

tests/test_black.py

@@ -1257,7 +1257,7 @@ def test_assert_equivalent_different_asts(self) -> None:
     def test_shhh_click(self) -> None:
         try:
             from click import _unicodefun
-        except ModuleNotFoundError:
+        except ImportError:
             self.skipTest("Incompatible Click version")
         if not hasattr(_unicodefun, "_verify_python3_env"):
             self.skipTest("Incompatible Click version")