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Lesson 24.4 Duck Typing

This partial typing from the previous video has a name. It is called duck typing. In this video we show both why this is so popular among Python programmers and also why it is so controversial.

From  Hannah Lee 46 plays

Lesson 23.8 Properties (OPTIONAL)

This video introduces an advanced topic that is completely optional and will not appear on any exam. Classes like RGB and Point3 appear to enforce their invariants without any getters and setters.…

From  Hannah Lee 18 plays

Lesson23.4 The is Operator

As we saw in the previous video, we cannot trust == if we need to test if two variables refer to the same object folder. In this video we show an alternative operator is, which is safe to use because…

From  Hannah Lee 41 plays

Lesson 23.3 Object Equality

Previously when we compared objects, we compared them attribute-by-attribute. That is because the meaning of == on objects is less clear. As we show in this video, that is because equality (and the…

From  Hannah Lee 60 plays

Lesson 23.1 The Principle of Abstraction

In this video we introduce the principle of abstraction, which is simply hiding unnecessary details about a class from the user of a class. However, there are many different ways to do that, which is…

From  Hannah Lee 51 plays