Web Reference: Jul 11, 2025 ยท 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. This method allows you to assign a value to a new key or update the value of an existing key. This approach is basic, readable, and works across all Python versions.
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