all_tests = list(range(10))

alpha = {1,2,5,7,9}
beta = {0,2,3,4,5,9}

beta - alpha

{0, 3, 4}

alpha - beta

{1, 7}

alpha & beta

{2, 5, 9}

alpha | beta

{0, 1, 2, 3, 4, 5, 7, 9}

set(all_tests) - alpha - beta

{6, 8}

{1,1,1,1}

{1}