Sets

• Sets are similar to lists or dictionaries.

• They are created using curly braces { }, and are unordered, which means that they can't be indexed.

• Due to the way they're stored, it's faster to check whether an item is part of a set using the in operator, rather than part of a list.

• Sets cannot contain duplicate elements.

add() function

• You can use the add() function to add new items to the set

• Example:

    nums = {1, 2, 1, 3, 1, 4, 5, 6}
  
    nums.add(-7)
  

remove() function

• You can use the remove() to delete a specific element to the set

• Duplicate elements will automatically get removed from the set.

• Example:

    nums = {1, 2, 1, 3, 1, 4, 5, 6}
  
    nums.remove(3)
  

len() function

• The len() function can be used to return the number of elements of a set.

• Example:

    nums = {1, 2, 1, 3, 1, 4, 5, 6}
  
    print(len(nums))