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18.1.1.Wrap a command in a functionWrap a command in a function
18.1.2.Use lambda as action commandUse lambda as action command
18.1.3.Wrap action command in a classWrap action command in a class
18.1.4.Wrap GUI design in a class: a button on a frame
18.1.5.Wrap GUI design in a class: layout controls and link actions
18.1.6.Add widgets to wrapped GUI classAdd widgets to wrapped GUI class
18.1.7.Define __getattr__ for wrapped GUI classDefine __getattr__ for wrapped GUI class
18.1.8.Default press actionDefault press action
18.1.9.bind actions: key pressedbind actions: key pressed