Web Reference: Jul 11, 2025 · This is the simplest way to add or update a key-value pair in a dictionary. We access the dictionary by specifying the key inside square brackets and assign the corresponding value. To update this dict with a single new key and value, you can use the subscript notation (see Mappings here) that provides for item assignment: We can also update the dict with multiple values efficiently as well using the update method. Starting with Python 3.5, you can use the unpacking operator (**) to merge multiple dictionaries or add new key-value pairs while creating a new dictionary. This is a clean, modern approach for combining and extending dictionaries without mutating the original.
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