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Sets are an unordered collection of unique values that can be modified at
runtime. This module shows how sets are created, iterated, accessed,
extended and shortened.
def main():
    # Let's define one `set` for starters
    simple_set = {0, 1, 2}
    # A set is dynamic like a `list` and `tuple`
    simple_set.add(3)
    simple_set.remove(0)
    assert simple_set == {1, 2, 3}
    # Unlike a `list and `tuple`, it is not an ordered sequence as it
    # does not allow duplicates to be added
    for _ in range(5):
        simple_set.add(0)
        simple_set.add(4)
    assert simple_set == {0, 1, 2, 3, 4}
    # Now let's define two new `set` collections
    multiples_two = set()
    multiples_four = set()
    # Fill sensible values into the set using `add`
    for i in range(10):
        multiples_two.add(i * 2)
        multiples_four.add(i * 4)
    # As we can see, both sets have similarities and differences
    assert multiples_two == {0, 2, 4, 6, 8, 10, 12, 14, 16, 18}
    assert multiples_four == {0, 4, 8, 12, 16, 20, 24, 28, 32, 36}
    # We cannot decide in which order the numbers come out - so let's
    # look for fundamental truths instead, such as divisibility against
    # 2 and 4. We do this by checking whether the modulus of 2 and 4
    # yields 0 (i.e. no remainder from performing a division)
    multiples_common = multiples_two.intersection(multiples_four)
    for number in multiples_common:
        assert number % 2 == 0 and number % 4 == 0
    # We can compute exclusive multiples
    multiples_two_exclusive = multiples_two.difference(multiples_four)
    multiples_four_exclusive = multiples_four.difference(multiples_two)
    assert len(multiples_two_exclusive) > 0
    assert len(multiples_four_exclusive) > 0
    # Numbers in this bracket are greater than 2 * 9 and less than 4 * 10
    for number in multiples_four_exclusive:
        assert 18 < number < 40
    # By computing a set union against the two sets, we have all integers
    # in this program
    multiples_all = multiples_two.union(multiples_four)
    # Check if set A is a subset of set B
    assert multiples_four_exclusive.issubset(multiples_four)
    assert multiples_four.issubset(multiples_all)
    # Check if set A is a subset and superset of itself
    assert multiples_all.issubset(multiples_all)
    assert multiples_all.issuperset(multiples_all)
    # Check if set A is a superset of set B
    assert multiples_all.issuperset(multiples_two)
    assert multiples_two.issuperset(multiples_two_exclusive)
if __name__ == "__main__":

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