Implicit vs Explicit typing [python-protocol] - Typescript to Python field guide

person.py

from typing import Protocol, Sequence
from dataclasses import dataclass


class PersonProtocol(Protocol):
    name: str
    age: int
    height: float
    friends: Sequence["PersonProtocol"]


# Person implicitly implements the PersonProtocol interface
@dataclass
class Person:
    name: str
    age: int
    height: float
    friends: Sequence[PersonProtocol]


jane: PersonProtocol = Person(name="Jane", age=25, height=1.74, friends=[])  # it works
tim: PersonProtocol = Person(
    name="Tim", age=23, height=1.71, friends=[jane]
)  # it works