--- a/eric6/Utilities/ModuleParser.py	Wed Apr 21 19:40:50 2021 +0200
+++ b/eric6/Utilities/ModuleParser.py	Thu Apr 22 18:02:47 2021 +0200
@@ -1540,10 +1540,11 @@
     """
     global _modules
     
-    if extensions is None:
-        _extensions = ['.py', '.pyw', '.ptl', '.rb']
-    else:
-        _extensions = extensions[:]
+    _extensions = (
+        ['.py', '.pyw', '.ptl', '.rb']
+        if extensions is None else
+        extensions[:]
+    )
     with contextlib.suppress(ValueError):
         _extensions.remove('.py')