Python – Creating and Using Sets
Python sets are used to store multiple items in a single variable, and unlike a list, are unordered, unchangeable, and unindexed.
Python – Accessing Items in a Set
A specific item cannot be accessed in a set by referring to an index or a key. To access items, a for loop or the in keyword can be used.
Python – Adding Items to a Set
Once a Python set is created, you cannot change its items, but you can add new items using the add() method and update() method.
Python – Removing Items from a Set
Once a Python set is created, you cannot change its items, but you can remove items using the remove(), discard(), pop(), and clear() methods, and the del keyword.
Python – Looping Through a Set
Python set items can be accessed by looping through them using a for loop.
Python – Joining Two or More Sets
Python sets can be joined (combined) using the union(), update(), intersection(), difference(), and symmetric_difference() methods.
Python – Set difference() Method
The Python set difference() method returns a set that contains the difference between two sets.
Python – Set difference_update() Method
The Python set difference_update() method removes the items that exist in both sets.
Python – Set discard() Method
The Python set discard() method removes the specified item from the set.
Python – Set intersection() Method
The Python set intersection() method returns a set that contains only items that exist in both sets, or in all sets if more than two sets are compared.
Python – Set intersection_update() Method
The Python set intersection_update() method removes the items that are not present in both sets, or in all sets if more than two sets are compared.
Python – Set isdisjoint() Method
The Python set isdisjoint() method returns True if none of the items are present in both sets, otherwise it returns False.
Python – Set issubset() Method
The Python set issubset() method returns True if all items in the set exists in the specified set, otherwise it returns False.
Python – Set issuperset() Method
The Python set issuperset() method returns True if all items in the specified set exists in the original set, otherwise it returns False.
Python – Set remove() Method
The Python set remove() method removes the specified element from the set.
Python – Set symmetric_difference() Method
The Python set symmetric_difference() method returns a set that contains all items from both sets, but not the items that are present in both sets.