Fix linters

Author: sergio-costas

examples.py

@@ -456,6 +456,7 @@ def example_29(new_title):
     emit.progress(new_title, update_titlebar=True)
     time.sleep(1.5)
 
+
 def example_30():
     """Set the window title twice, to test if there is a delay when
     changing the title"""