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A Python dictionary or “dict” is a place in memory to store a series of values – also called a collection. The dictionary is special because values are not referenced in order using a numerical index. In a dictionary, values are referenced with a user-defined key, just as words in a physical dictionary are “keys” associated with the “value” of their meaning. Python dictionaries are more feature-rich than lists, but don’t require as much effort as a user defined class.