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. The difference comes ...

Previous PEPs to add pattern matching — PEP 275 and PEP 3103, proposed in 2001 and 2006 respectively — were turned down due to lack of popular support. PEP 3103 was drafted by Python creator ...