diff --git a/setup.py b/setup.py
index 6171755f..c7e59f9c 100644
--- a/setup.py
+++ b/setup.py
@@ -38,10 +38,12 @@
 class sdist(_sdist):
     """Custom sdist building using cython
     """
+
     def run(self):
         # Make sure the compiled Cython files in the distribution
         # are up-to-date
         from Cython.Build import cythonize
+
         cythonize(["src/pluggy/callers/cythonized.pyx"])
         _sdist.run(self)
 
@@ -50,12 +52,11 @@ def run(self):
     from Cython.Build import cythonize
     print("Building Cython extension(s)")
     exts = cythonize(["src/pluggy/callers/cythonized.pyx"])
-    cmdclass['sdist'] = sdist
+    cmdclass["sdist"] = sdist
 except ImportError:
     # When Cython is not installed build from C sources
     print("Building C extension(s)")
-    exts = [Extension("pluggy.callers.cythonized",
-                      ["src/pluggy/callers/cythonized.c"])]
+    exts = [Extension("pluggy.callers.cythonized", ["src/pluggy/callers/cythonized.c"])]
 
 
 def main():
@@ -74,7 +75,7 @@ def main():
         install_requires=['importlib-metadata>=0.12;python_version<"3.8"'],
         extras_require=EXTRAS_REQUIRE,
         classifiers=classifiers,
-        packages=['pluggy', 'pluggy.callers'],
+        packages=["pluggy", "pluggy.callers"],
         package_dir={"": "src"},
         ext_modules=exts,
         cmdclass=cmdclass,
diff --git a/src/pluggy/callers/__init__.py b/src/pluggy/callers/__init__.py
index 2a3e030a..38695b27 100644
--- a/src/pluggy/callers/__init__.py
+++ b/src/pluggy/callers/__init__.py
@@ -6,7 +6,7 @@
 from .._result import HookCallError, _Result, _raise_wrapfail
 from .cythonized import _c_multicall
 
-__all__ = ['_multicall', '_c_multicall']
+__all__ = ["_multicall", "_c_multicall"]
 
 
 def _multicall(hook_impls, caller_kwargs, firstresult=False):
diff --git a/testing/benchmark.py b/testing/benchmark.py
index f98fbcca..fd048ac8 100644
--- a/testing/benchmark.py
+++ b/testing/benchmark.py
@@ -38,10 +38,7 @@ def wrappers(request):
     return [wrapper for i in range(request.param)]
 
 
-@pytest.fixture(
-    params=[_multicall, _c_multicall],
-    ids=lambda item: item.__name__
-)
+@pytest.fixture(params=[_multicall, _c_multicall], ids=lambda item: item.__name__)
 def callertype(request):
     return request.param