_getconftestmodules: optimize

src/_pytest/config/__init__.py

@@ -378,17 +378,19 @@ class PytestPluginManager(PluginManager):
     def _getconftestmodules(self, path):
         if self._noconftest:
             return []
-        try:
-            return self._path2confmods[path]
-        except KeyError:
+
         if path.isfile():
-                clist = self._getconftestmodules(path.dirpath())
+            directory = path.dirpath()
         else:
+            directory = path
+        try:
+            return self._path2confmods[directory]
+        except KeyError:
             # XXX these days we may rather want to use config.rootdir
             # and allow users to opt into looking into the rootdir parent
             # directories instead of requiring to specify confcutdir
             clist = []
-                for parent in path.parts():
+            for parent in directory.parts():
                 if self._confcutdir and self._confcutdir.relto(parent):
                     continue
                 conftestpath = parent.join("conftest.py")
@@ -396,7 +398,7 @@ class PytestPluginManager(PluginManager):
                     mod = self._importconftest(conftestpath)
                     clist.append(mod)
 
-            self._path2confmods[path] = clist
+            self._path2confmods[directory] = clist
             return clist
 
     def _rget_with_confmod(self, name, path):