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How to Add to a Dictionary in Python: Methods, Use Cases, and Key Differences
Dictionaries are one of Python's most powerful built-in data structures. They store data as key-value pairs, making them ideal for lookups, configuration settings, counting, grouping, and countless other tasks. Knowing how to add entries to a dictionary — and which method to use — is foundational to writing effective Python code.
What Is a Python Dictionary?
A Python dictionary (dict) holds an unordered collection of items where each key maps to a value. Keys must be unique and immutable (strings, numbers, or tuples). Values can be anything: strings, lists, other dictionaries, functions, or objects.