Learn how to define new functions and procedures.
Learn that we can use libraries containing functions and procedures written by others.
Learn that any name can be renamed, even Python’s internal names.
Earlier we learned about how a variable can store a value in a memory location (box). The “value” can be anything. It doesn’t have to just be a number or a string. It can be steps, instructions, and even other names. This ability to name other things is key to Alan Turing’s vision of a computer.