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Dictionary methods

Dictionaries, as hashable arrays rather than sequences, have a number of methods that are unique to them, and only a few of the sequence-specific methods are similar. The following is a list of the dictionary-specific methods:

• len(dict): Returns the number of items in a dictionary.
• dict[key]: Returns the value associated with key. If the specified key is not in the dictionary, an error is generated.
• dict[key] = value: Sets the association of key to value.
• del dict[key]: Deletes the indicated key, and its associated value, from the dictionary. If key doesn't exist, an error is generated.
• key in dict: If the dictionary has the specified key name, returns True; otherwise, returns False.
• key not in dict: If the dictionary ...