Python has been the language of data science since before machine learning was trendy, and now you can use it for building AI ...

This is clearly not what you wanted to do. Python versions 3.6 and higher provide “type annotations,” a feature that enables you to define the type of data each function argument should take.

Python 3 introduced the idea of "type annotations," and as of Python 3.6, you can annotate variables, not just function parameters and return values. The idea is that you can put a colon (:) and then ...

Standards proposal would allow annotations to be checked by external type checkers like TypeScript but treated as comments by the JavaScript engine.

This is clearly not what you wanted to do. Python versions 3.6 and higher provide “type annotations,” a feature that enables you to define the type of data each function argument should take.