Want the unique keys from two #Python dicts? dict.keys() returns a set-like object, supporting set operators: d1 = {'a':10, 'b':20, 'c':30} d2 = {'b':22, 'c':33, 'd':44} d3 = {'a':10} d1.keys() | d2.keys() # {'b', 'c', 'a', 'd'} d3.keys() < d1.keys() # True

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