MainWindow: Minor change.

src/View/MainWindow.py

@@ -113,7 +113,7 @@ try:
     from View.Doc.Window import DocWindow
     _doc = "internal"
 except Exception as e:
-    print("Handle exception: {e}")
+    print(f"Handle exception: {e}")
     _doc = "external"
 
 from Model.Study import Study