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How can I merge two Python dictionaries in a single expression? For dictionaries x and y, z becomes a merged dictionary with values from y replacing those from x. In Python 3.5 or greater: x = {'a':'1', 'b':'2', 'c':'3'} y = {'d':'4', 'e':'5', 'f':'6'} z = {**x, **y} print(z) {'a': '1', 'b': '2', 'c': '3', 'd': '4', 'e': '5', 'f': '6'} Another example: w = {'foo': 'bar', 'baz': 'qux', **y} # mer..