Type Hints (Type annotations)

• Type Hints or annotations are a special syntax that allow declaring the type of a variable.

type SetOfIntegers = set[int]

a: SetOfIntegers = {1, 2, 3}
b: set[int] = {1, 2, 3}

Classes as types

class Person:
    def __init__(self, name: str):
        self.name = name


person: Person = Person("Henry")

• Types are usually represented in form of classes

Generic Types

• Types that take parameters. Example: dict[str, int]