builtin_set.py

s = {1,2,3}
s.add(4)
print(s)
# {1,2,3,4}

s.remove(3)
print(s)
# {1,2,4}

s1 = {1,2,3}
s2 = {2,3,4}

s_union = s1 | s2
s_union = s1.union(s2)
print(s_union)
# {1,2,3,4}

s_union = s1.union(s2, [5,6])
print(s_union)
# {1,2,3,4,5,6}

s_intersection = s1 & s2
s_intersection = s1.intersection(s2)
print(s_intersection)
# {2,3}

s_difference = s1 - s2
# {1}

s_symmetric_difference = s1 ^ s2
# {1,4}

# issubset()
# TBD
# isupperset()
# TBD
# isdijoint()
# TBD