Learn how Python's dictionary data structure works as a powerful and versatile way to store and retrieve objects and data in your applications.

Feed this a dict with nested dicts and it'll find all the key value pairs. Parameters d : dict Pass a dictionary here. sep : str, default '_' separator using in constructing new keys. *ancestor_keys ...

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That loop is creating a load of empty dictionaries, then your second loop is overwriting those dictionaries with new ones that have your desired data already contained within.