Even if you ignore all the other benefits of type annotations, merely being explicit about the types of parameters your function accepts helps people reading your code.<p>If you&#x27;re going to make the argument that you can just add comments with the types - well then that&#x27;s exactly what mypy is doing, but if you do it in the mypy format you get static analysis of your types for free.<p>Static typing and unit testing aren&#x27;t mutually exclusive.