Rely on pytest_perf 0.9 and the new Python syntax.

exercises.py

@@ -0,0 +1,32 @@
+from pytest_perf.deco import extras
+
+
+@extras('perf')
+def discovery_perf():
+    "discovery"
+    import importlib_metadata  # end warmup
+    importlib_metadata.distribution('ipython')
+
+
+def entry_points_perf():
+    "entry_points()"
+    import importlib_metadata  # end warmup
+    importlib_metadata.entry_points()
+
+
+@extras('perf')
+def cached_distribution_perf():
+    "cached distribution"
+    import importlib_metadata
+    importlib_metadata.distribution('ipython')  # end warmup
+    importlib_metadata.distribution('ipython')
+
+
+@extras('perf')
+def uncached_distribution_perf():
+    "uncached distribution"
+    import importlib
+    import importlib_metadata
+    # end warmup
+    importlib.invalidate_caches()
+    importlib_metadata.distribution('ipython')

setup.cfg

@@ -51,7 +51,7 @@ testing =
 	pep517
 	pyfakefs
 	flufl.flake8
-	pytest-perf >= 0.6.2
+	pytest-perf >= 0.9
 
 docs =
 	# upstream