Pygame Code: Snake Game

Code for Pygame: Snake Game.

import pygame
from pygame.locals import *

class Snake:
    def ___init__(self,parent_screen):
        self.parent_screen = parent_screen
        self.block = pygame.image.load("resources/block.jpg").convert()
        self.x =100
        self.y =100

        def draw (self):
            self.parent_screen.fill((110, 110, 5))
            self.parent_screen.blit(self.block, (self.x, self.y))
            pygame.display.flip()

        def move_left(self):
            self.x-= 10
            self.draw()

            def move_right(self):
                self.x += 10
                self.draw()

                def move_up(self):
                    self.x -= 10
                    self.draw()

                    def move_down(self):
                        self.x += 10
                        self.draw()

    class Game:


        def ___init__(self):
            pygame.init()
            self.surface = pygame.display.set_mode((1000, 500))
            self.surface.fill((110, 110, 5))
            self.snake = Snake(self.surface)
            self.snake.draw()
        def run(self):
            running = True

            while running:
                for event in pygame.event.get():
                    if event.type == KEYDOWN:
                        if event.key == K_ESCAPE:
                            running = False
                        if event.key == K_UP:
                            self.snake.move_up()

                        if event.key == K_DOWN:
                            self.snake.move_down()

                        if event.key == K_LEFT:
                            self.snake.move_left()


                        if event.key == K_RIGHT:
                            self.snake.move_right()
                    elif event.type == QUIT:
                        running = False
                        pass


class Game(object):
    pass


if __name__ == '__main__':
    game = Game()
    game.run()

The Error with this code is the (game.run) code. The Error is showing that there is no such attribute. I have followed the video of freecodecamp on Youtube. Link of video- (Code a Snake Game with Python and Pygame 🐍 - Tutorial - YouTube)

Please help me with the same.

The Game class is indented inside the Snake class and then you have another Game class at the bottom