Web Reference: Jul 23, 2025 · update () method takes another dictionary or an iterable of key-value pairs as input. It adds the new items to the dictionary or updates the values of existing keys. Update Dictionary 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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