[Python] How do I merge two dictionaries in a single expression in Python?

I want to merge two dictionaries into a new dictionary.

x = {'a': 1, 'b': 2}
y = {'b': 3, 'c': 4}
z = merge(x, y)

>>> z
{'a': 1, 'b': 3, 'c': 4}


Whenever a key k is present in both dictionaries, only the value y[k] should be kept.

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