# sets are unordered collections set = {1.0, 10, 'String', (1, 0, 1, 0)} set # set([(1, 0, 1, 0), 10, 'String', 1.0]) 'String' in set # True 'Java' in set # False # add to set set.add('Python') # set(['Python', (1, 0, 1, 0), 10, 'String', 1.0]) # remove from set set.remove('Python') # set([(1, 0, 1, 0), 10, 'String', 1.0]) # set operations set_one = {1, 2, 3} # set([1, 2, 3]) set_two = {3, 4, 5} # set([3, 4, 5]) set_one | set_two # set([1, 2, 3, 4, 5]) (Union) set_one & set_two # set([3]) (Intersection) set_one - set_two # set([1, 2]) (Difference) set_one ^ set_two # set([1, 2, 4, 5]) (Symmetric difference) # subset and superset set_a = {1, 2} set_b = {1, 2} set_c = {1, 2, 3, 4, 5} set_a < set_b # False (Strict subset) set_a <= set_b # True (Subset) set_c > set_a # True (Strict superset)