set method in python

# A set contains unique elements of which the order is not important
s = set()
# Can also be created from a list (or some other data structures)
num_list = [1,2,3]
set_from_list = set(num_list)

Here is what the above code is Doing:
1. Create an empty set
2. Add 1 to the set
3. Add 2 to the set
4. Remove 1 from the set
5. Print the set
6. Create a list of numbers
7. Create a set from the list