Lesson 4.1
Classes and Instances
A class is a template; an instance is one object built from it. The initialiser runs at construction and sets up instance state.
Lessons and exercises
Classes in a language with no enforced privacy. Encapsulation here is a convention the programmer upholds rather than a rule the language imposes, which changes how it must be taught.
Lesson 4.2
Instance Versus Class Attributes
An attribute set on the class is shared by every instance; one set in the initialiser belongs to that instance alone.
Lesson 4.3
Methods and Encapsulation
Python marks intended privacy by naming convention rather than enforcement, so encapsulation is a contract between programmers.
Lesson 4.4
Special Methods
Defining the string representation and equality methods makes an object print usefully and compare sensibly.
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