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When we break up out application in multiple classes, we need to give each class a role. One of the most popular ways to do this is designate a class as a model, a view or a controller. In this video…

We know what happens when we call a function. But as we show in this video, Python also does something very important when we define a function. It has to store the definition somewhere.

The one thing that we have not talked about yet are the preconditions in a specification. However, as this video shows, they are arguably the most important part of the specification. They are what…