Sets are a type of data structure in Python which are used to store unique elements. They are unordered and do not allow duplicates.

To create a set in Python, use the set() function. For example:

my_set = set([1, 2, 3, 4, 5])

This will create a set containing the numbers 1, 2, 3, 4, and 5.

To add elements to a set, use the add() method. For example:

my_set.add(6)

This will add the number 6 to the set.

To remove elements from a set, use the remove() method. For example:

my_set.remove(3)

This will remove the number 3 from the set.

To check if an element is present in a set, use the in keyword. For example:

if 5 in my_set:
print(„5 is present in the set”)

This will print the message „5 is present in the set” if the number 5 is present in the set.

To get the number of elements in a set, use the len() function. For example:

num_elements = len(my_set)

This will store the number of elements in the set (in this case, 5) in the variable num_elements.