I’m analyzing some old code that I’ve inherited, and I have a question about the use of "self" and "None" keywords, specifically in the following example:
def run(self) -> None:
I understand that the self keyword is similar to the "this" keyword in C++ in that, in conjunction with the dot operator, it allows us to access the attributes and methods of the class in question. What I’m really interested in is the use of "-> None" in the declaration of the method named "run." Is this in PEP 8 because I can’t find an example. I’m using Python 3.7, in case that matters.
What is the purpose of writing a method in this manner? What does "-> None" do?
>Solution :
They’re called type hints, and they enable annotating the types of the parameters and return types of functions.
https://peps.python.org/pep-0484/