Add item(s) in a Set

S.add(val)

S.update(val1, val2)

Add Item(s) in a Set.

# A new empty set
S = set()
S.add("Red")
print(S)                                               # {'Red'}

# Add multiple items
S.update(["Blue", "Green"])
print(S)                                               # {'Red', 'Blue', 'Green'}

See also

https://www.w3resource.com/python-exercises/sets/python-sets-exercise-3.php