Now that we know how to access two-dimensional lists, modifying the elements should come naturally.

Let’s return to a classroom example, but now instead of heights or test scores, our list stores the student’s favorite hobby!

class_name_hobbies = [["Jenny", "Breakdancing"], ["Alexus", "Photography"], ["Grace", "Soccer"]]

"Jenny" changed their mind and is now more interested in "Meditation".

We will need to modify the list to accommodate the change to our class_name_hobbies list. To change a value in a two-dimensional list, reassign the value using the specific index.

# The list of Jenny is at index 0. The hobby is at index 1. 
class_name_hobbies[0][1] = "Meditation"
print(class_name_hobbies)

Would output:

[["Jenny", "Meditation"], ["Alexus", "Photography"], ["Grace", "Soccer"]]

Negative indices will work as well.

# The list of Grace is the last entry. The hobby is the last element. 
class_name_hobbies[-1][-1] = "Football"
print(class_name_hobbies)

Would output:

[["Jenny", "Meditation"], ["Alexus", "Photography"], ["Grace", "Football"]]