listboxes - generators requests indentation sample code - inheritance - using instances character constants - creating check boxesdisabling singleton pattern - checkbox builder checkbuttonsgrid layouts - circleseeding class - class adapter class_init_method classes - isoscelestriangle classtemplate pattern keymoderator classcommand pattern naming conventions plotstategy classstrategy pattern - blank lines point classtemplate pattern boss class query classfacade pattern - composite pattern results classfacade pattern visitor pattern - static classessingleton pattern bvacationvisitor classvisitor pattern - camelcase caretaker classmemento pattern - collections communicating between stdtriangle classtemplate pattern subclassesfactory pattern - table classfacade pattern template classmethods traversing series of classesvisitor pattern context classstrategy pattern triangle classtemplate pattern - creating variable classinterpreter pattern database classfacade pattern - variables - decorator class - verb classinterpreter pattern derived classes visiting docstrings visitor class - employee classcomposite pattern - facade classesbuilding - factory classesoperation of - factory method pattern circleseeding class - event classes - straight seeding class - swimmer class - cloning - codingimpenetrable collections classes dictionaries combining listing using -