How to avoid "SyntaxError expected an indented block"?

I’ve checked that I have 4 spaces. But the error still shows up. I’m using classes for the first time. I do not know why, but when I copy-paste working code, the error still shows up.
Here’s the code:

import pygame, sys, random, time
from pygame.locals import *
pygame.init()

s=600

BLUE  = (0, 0, 255)
RED   = (255, 0, 0)
GREEN = (0, 255, 0)
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)

disp=pygame.display.set_mode((600,600))
disp.fill(BLACK)
pygame.display.set_caption("Game")

class Apple(pygame.sprite.Sprite):
    def _init_(self):
        super()._init_()
        self.image=pygame.image.load("Leaf.png")
        self.rect=self.image.get_rect()
        self.rect.center=(random.randint(10,s-10),(10,s-10))
    def ate(self):
        
class Player(pygame.sprite.Sprite):
    def _init_(self):
        super().__init__() 
        self.image = pygame.image.load("Ant.png")
        self.rect = self.image.get_rect()
        self.rect.center = (160, 520)
    def move(self):
        pressed_keys=pygame.key.get_pressed()
        if self.rect.up > 0:
            if pressed_keys[K_UP]:
                self.rect.move_ip(0, -5)
        if self.rect.down<s:
            if pressed_keys[K_DOWN]:
                self.rect.move_ip(0,5)
        
        if self.rect.left > 0:
              if pressed_keys[K_LEFT]:
                  self.rect.move_ip(-5, 0)
        if self.rect.right < s:        
              if pressed_keys[K_RIGHT]:
                  self.rect.move_ip(5, 0)
P1=Player()
A1=Apple()

The error is in the line class Player(pygame.sprite.Sprite):.

I tried 4 spaces and tab. It still didn’t work. I do not know how to fix the code. I need help.

>Solution :

A function definition must contain a body, even if it’s a trivial body like pass.

class Apple(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.image.load("Leaf.png")
        self.rect = self.image.get_rect()
        self.rect.center = (random.randint(10, s-10), (10, s-10))

    def ate(self):
        pass

Without pass following the :, the parser is looking for the body, but the next text it finds is the unindented definition of Player, resulting in the observed error.

See Why does python allow an empty function (with doc-string) body without a "pass" statement? for more information about what can serve as a "minimal" function body aside from the pass statement.