Most of the article is code snippets and tools demonstration. The author showed how he write clean and testable code, but didn’t tell why code written that way is clean and testable.

A succesful software developer will devise a way to run the tests in an easily automated fashion, so they can continuously prove the software works. They are aware of the dangers of needless complexity. They are humble in their approach, seek critical review, and expect refactoring at every step of the way. They continuously think about how they can ensure their software is testable, readable, and maintainable. Although Python the language, and Python the community, are heavily influenced by desire to write clean, maintainable code that works, it is still quite easy to do the exact opposite. In this article, we will tackle this problem head on and explore how to write clean, testable, high quality code in Python.