What are list slices? What for can you use them?

List slice is an extracted part of the list containing the requested elements. The list slice is a list in itself. All list operations can be performed on a list slice. List slices are used to copy the required elements to a new list and to modify the required parts of the list. For example,

lst = [1, 2, 3, 4, 5]
lst2 = lst[1:4] #lst2 is [2, 3, 4]

#Using Slices for list modification
lst[0:2] = [10, 20] #lst becomes [10, 20, 3, 4, 5]