Mastering Python Design Patterns - Second Edition

Real-world examples

A musician is an example of the Interpreter pattern in reality. Musical notation represents the pitch and duration of a sound graphically. The musician is able to reproduce a sound precisely based on its notation. In a sense, musical notation is the language of music, and the musician is the interpreter of that language.

We can also cite software examples:

• In the C++ world, boost::spirit is considered an internal DSL for implementing parsers.
• An example in Python is PyT, an internal DSL to generate (X)HTML. PyT focuses on performance and claims to have comparable speed with Jinja2 j.mp/ghpyt. Of course, we should not assume that the Interpreter pattern is necessarily used in PyT. However, since it is an internal DSL, ...