04:53 duration 4 minutes 53 seconds
Lesson 20.8 The None Value
We have seen the None value used in several previous videos. But in this video we finally introduce it formally. In particular, we show why it is so commonly used in object initialization.
05:40 duration 5 minutes 40 seconds
Lesson 5.2 Procedures
In this video, we show you how to define a procedure in the Python interactive shell. Recall that a procedure is a function that is used as a command.
12:43 duration 12 minutes 43 seconds
Lesson 0.1 The Command Line
This first video introduces you to the command line, which is a text-based tool for interacting with files and programs.