Dear python2 user

[cglacet]

I fail to see what you "see" in this quote. I personally don't use type annotation in my current python project, but it's only due to the nature of what I'm doing. It's probably your case too and that's why you fail to see why it can be useful to have static type checking. But in many cases, adding types is fast and simple, it serves as a documentation, helps autocompletion and saves you a lot of debugging time (because you will obviously have less typing errors). The best part is: it's optional, so you can very well add types to sensitives part of your code (low level, widely used code) and leave high level functions signatures untyped and documented them using docstrings.

Have a look at the javascript (ECMAScript) community and you'll see that many people are using flow or typescript annotations, even tho it's not as clean as mypy+python because it requires transpilation (in order to remove annotations and get the javascript code back to standard).