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Concept visual
Once a set is created, you cannot change its items, but you can add new items. To add one item to a set use the add() method.
Add an item to a set, using the add() method:
thisset = {"apple", "banana", "cherry"}
thisset.add("orange")
print(thisset)To add items from another set into the current set, use the update() method.
thisset = {"apple", "banana", "cherry"}
tropical = {"pineapple", "mango", "papaya"}
thisset.update(tropical)
print(thisset)method does not have to be a set, it can be any iterable object (tuples, lists, dictionaries etc.).
Add elements of a list to a set:
thisset = {"apple", "banana", "cherry"}
mylist = ["kiwi", "orange"]
thisset.update(mylist)
print(thisset)