Python Demo: Reading a JSON file and adding to it -- new elements in lists and new key-value pairs

In this video we look at two short Python programs. The first reads a JSON file containing a list of dictionaries with employee first and last names. It prompts the user for new data, then it creates a new employee dictionary and adds it to the list. Finally it prints out the resulting JSON and writes it (dumps it) to an external file. The second Python program starts with the same employee JSON file. This time after reading the data, it constructs usernames from the first and last name data and adds a "username" key-value pair to each employee dictionary.