This design pattern is rather similar to Polymorphism, which I described first. In fact, just like before, we’ll use Python’s abstract-base class library to implement it.

For example, perhaps the Gang of Four should have named their book Software Design Patterns. As I discussed in Part 2, design patterns can be misused, and anti-patterns can emerge.

Design Patterns is essentially a catalog of 23 software design patterns. Despite presenting a short tutorial on each pattern along with a larger case study, the book is largely laid out as a ...