How to Specify Function Types with Type Hints in Python?

How to Designate Function Types in Type Hints

In Python, specifying type hints for function variables can be done using typing.Callable.

Function Parameter Specification

To specify the type hint of a variable as a function, use the following syntax:

from typing import Callable

def my_function(func: Callable):

Input and Output Type Definition

The Callable type can be further refined to specify the types of input and output parameters:

def sum(a: int, b: int) -> int:
    return a + b

Type Hint:

Callable[[int, int], int]

General Syntax

The general syntax for specifying a function type in a type hint is:

Callable[[ParamType1, ParamType2, ..., ParamTypeN], ReturnType]

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