adding menus to windows using the labelframe moving on examples on github visual programming of tables of data creating listbox displaying the state data using combobox the treeview widget inserting tree nodes moving on example code on github what are design patterns defining design patterns the learning process notes on object-oriented approaches python design patterns references iicreational patterns the factory pattern how factory works sample code the two subclasses building the simple factory using the factory simple gui factory patterns in math computation programs on github thought questions the factory method pattern the swimmer class the event classes straight seeding circle seeding xi