Exercise for reference: 

Please update the dictionary by changing the second employee's last name from Smith to Smooth or whatever takes your fancy.

d = {"employees":[{"firstName": "John", "lastName": "Doe"},
                {"firstName": "Anna", "lastName": "Smith"},
                {"firstName": "Peter", "lastName": "Jones"}],
"owners":[{"firstName": "Jack", "lastName": "Petter"},
          {"firstName": "Jessy", "lastName": "Petter"}]}

Answer: 

d['employees'][1]['lastName'] = "Smooth"

Explanation:

On the left side of the assignment operator, we are accessing Smith  as we did in the previous exercise. Then using the assignment operator, we simply assign a new string to that item.