Web Reference: Nov 1, 2025 Β· If the same key exists in both, the value from the second dictionary replaces the value from the first. Letβs explore different methods to merge or concatenate two dictionaries in Python. How can I merge two Python dictionaries in a single expression? For dictionaries x and y, their shallowly-merged dictionary z takes values from y, replacing those from x. 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.
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