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This is the first lesson of our LiveLessons video course that you can skip and come back to later. It goes into detail about Python's memory model and is strongly recommended viewing but may be too advanced for those who are just learning Python. Topics covered in this lesson include objects, references, and memory management. It also features a way of categorizing each of the standard types using various models to help you learn and understand them much better; then concludes several quizzes to test your comprehension.