COMPSCI 61A Lecture 12: Mutable Sequences
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COMPSCI 61A Full Course Notes
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Document Summary
To explore the power of values that can mutate, or change. Data abstraction allows us to think of compound/complex values as objects. Many compound values have state that changes over time (property of being mutable) Returns last element and removes it from list list. extend([sub-list]) Adds sub-list to the end of a list. Can"t be mutable values, such as lists and dictionaries. You can use a tuple as a dictionary key, but you can"t use a list (or a tuple that contains a list) as a dictionary key. Not only does your dictionary key have to be immutable, it must contain all immutable values. If you want to associate multiple values with a key, store them all in a sequence value. A function can change the value of any object in its scope. Even though an object is bound to something in the global frame, if it is referenced within a function it can be mutated in the global frame.
