Web Reference: Feb 16, 2026 · update () method in Python dictionary is used to add new key-value pairs or modify existing ones using another dictionary, iterable of pairs or keyword arguments. If a key already exists, its value is replaced. If the key does not exist, it is added to the dictionary. Adding an item to the dictionary is done by using a new index key and assigning a value to it: The update() method will update the dictionary with the items from a given argument. If the item does not exist, the item will be added. The argument must be a dictionary, or an iterable object with key:value pairs. The most direct and commonly used way to add or update items in a Python dictionary is by using square brackets ([]) with the assignment operator (=). This method allows you to assign a value to a new key or update the value of an existing key.
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