Python 3 type check not works with use typing module?

Question

Why does type checking not work in Python 3?

I have done the following code with type checks or hints:

import typing

def hello(message: str):
    pr         


        

Answer 1

Python 3 doesn't have the kind of type checking you're looking for.

def hello(message: str):

This is a function annotation.

https://www.python.org/dev/peps/pep-3107/

All it does is associate a bit of extra data with the function object. This can be inspected later on the func_annotations attribute of the function.

It has no built-in behavior beyond this. The intent is for third-parties to build behavior on top of this.