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. Oct 15, 2025 · Despite their versatility, there’s no built-in add method for dictionaries. Instead, there are several ways to add to and update a dictionary, each with its own use case and advantages. In this article, you’ll learn different methods to add to and update Python dictionaries.
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