def(self,function: Callable)->Tuple[float,res]: what's this ?

Question

I saw some libraries source code in Python , it have def(self,function: Callable)->Tuple[float,res]:
I don't known what's this '' Can any one Explain It to me Give any hint about It ''
Project Link --- https://github.com/Alfex4936/python-bigO-calculator

Answer 1

Python allows you to attach metadata to functions describing their parameters and return values.

def fn (self, function: Callable) -> Tuple[float,res]:

: Callable tells people who are reading the program that function should be the Callable parameter.

It is accessed as is
fn.__ annotations __ ['function']
returns typing.Callable
and has no meaning by itself.

The same with the return value of the function -> Tuple[float,res] is
fn.__ annotations __ ['return']
returns typing.Tuple[float, __main__.res]

This is a function annotation that says that the function has Callable parameter and returns a tuple with floats or res objects (but not necessarily).

https://code.sololearn.com/cHmdsW5sU23E/?ref=app

Answer 2

Type Annotations in 🐍
https://link.medium.com/i9Qrb5yydkb

Answer 3

Its a function definition. The first line it looks like.

Answer 4

Callable is probably in exchange for ()

-> showes the return value

Look at the code and see how its used

Answer 5

Slick thanks for ans it , function : Callable means & what's ` -> ` explain this 🤥