Cleanup in packaging: don’t unnecessarily instantiate exceptions
diff --git a/Lib/packaging/pypi/simple.py b/Lib/packaging/pypi/simple.py
index c492179..c372c6f 100644
--- a/Lib/packaging/pypi/simple.py
+++ b/Lib/packaging/pypi/simple.py
@@ -189,7 +189,7 @@
         self._process_index_page(predicate.name)
 
         if predicate.name.lower() not in self._projects:
-            raise ProjectNotFound()
+            raise ProjectNotFound
 
         releases = self._projects.get(predicate.name.lower())
         releases.sort_releases(prefer_final=prefer_final)