Add Items
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.
Example
Add an item to a set, using the add() method:
thisset = {“apple”, “banana”, “cherry”}
thisset.add(“orange”)
print(thisset)
Output:
{‘orange’, ‘apple’, ‘cherry’, ‘banana’}
Add Sets
To add items from another set into the current set, use the update() method.
Example
Add elements from tropical into thisset:
thisset = {“apple”, “banana”, “cherry”}
tropical = {“pineapple”, “mango”, “papaya”}
thisset.update(tropical)
print(thisset)
Output:
{‘apple’, ‘mango’, ‘cherry’, ‘pineapple’, ‘banana’, ‘papaya’}
Add Any Iterable
The object in the update() method does not have to be a set, it can be any iterable object (tuples, lists, dictionaries etc.).
Example
Add elements of a list to at set:
thisset = {“apple”, “banana”, “cherry”}
mylist = [“kiwi”, “orange”]
thisset.update(mylist)
print(thisset)
Output:
{‘banana’, ‘cherry’, ‘apple’, ‘orange’, ‘kiwi’}