![python type annotations python type annotations](https://miro.medium.com/max/1400/1*-Z7EE3erNGcQqUiscdyG3g.png)
Looking at this fragment with type annotations, all of these questions are trivial to answer: Does this argument need to be a list, or can I give a tuple or a set?.What is the type of the id attribute: is it int, str, or perhaps some custom type?.
![python type annotations python type annotations](https://image.slidesharecdn.com/typeannotations-170713081947/95/type-annotations-in-python-whats-whys-and-wows-16-638.jpg)
![python type annotations python type annotations](https://miro.medium.com/max/1104/1*woP3KGIwvBYAUlEAZ0GfjQ.png)
(Mypy is an open source project, and the core team is employed by Dropbox.)ĭropbox has been one of the first companies to adopt Python static type checking at this scale. To mitigate this, we have been gradually migrating our code to static type checking using mypy, likely the most popular standalone type checker for Python. At our scale-millions of lines of Python-the dynamic typing in Python made code needlessly hard to understand and started to seriously impact productivity. It’s our most widely used language both for backend services and the desktop client app (we are also heavy users of Go, TypeScript, and Rust).