python typing module.

from typing import List


class Person(object):
    def __init__(self, given_name: str = 'John',
                 surname: str='Doe',
                 nicknames: List[str] = ['Jonny', 'old mate']):
        self._given_name: str = given_name
        self._surname: str = surname
        self._nicknames: List[str] = nicknames