Why Kenneth in the beginning of class initiates attribute?

import random


class Sneaky:

    def __init__(self, sneaky=True, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.sneaky = sneaky

    def hide(self, light_level):
        return self.sneaky and light_level < 10

class Agile:

    def __init__(self, agile=True, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.agile = agile

    def evade(self):
        return self.agile and random.randint(0, 1)

import random

from characters import Character
from attributes import Agile, Sneaky


class Thief(Sneaky, Agile, Character):
    def pickpocket(self):
        return self.sneaky and bool(random.randint(0, 1))

class Character:

    def __init__(self, name='', **kwargs):
        self.name = name

        for key, value in kwargs.items():
            setattr(self, key, value)