initial

enemy.py

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+from settings import SCREEN_HEIGHT, SCREEN_WIDTH
+import random
+import pygame
+
+class Enemy(pygame.sprite.Sprite):
+    def __init__(self):
+        super(Enemy, self).__init__()
+        self.surf = pygame.Surface((20, 10))
+        self.surf.fill((255, 0, 0))
+        self.rect = self.surf.get_rect(
+            center=(
+                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
+                random.randint(0, SCREEN_HEIGHT),
+            )
+        )
+        self.speed = random.randint(1, 5)
+
+    def update(self):
+        self.rect.move_ip(-self.speed, 0)
+        if self.rect.right < 0:
+            self.kill()

main.py

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+import pygame
+from player import Player
+from enemy import Enemy 
+from settings import SCREEN_HEIGHT, SCREEN_WIDTH
+
+from pygame.locals import (
+    K_UP,
+    K_DOWN,
+    K_LEFT,
+    K_RIGHT,
+    K_ESCAPE,
+    KEYDOWN,
+    QUIT,
+)
+
+pygame.init()
+
+
+screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
+
+
+running = True
+
+player = Player()
+
+enemy = Enemy()
+
+enemies = pygame.sprite.Group()
+all_sprites = pygame.sprite.Group()
+
+all_sprites.add(player)
+all_sprites.add(enemy)
+
+enemies.add(enemy)
+
+
+while running:
+    for event in pygame.event.get():
+        if event.type == KEYDOWN:
+            if event.key == K_ESCAPE:
+                running = False
+
+        elif event.type == QUIT:
+            running = False
+
+    screen.fill((255, 255, 255))
+    
+    pressed_keys = pygame.key.get_pressed()
+
+    player.update(pressed_keys)
+
+    enemy.update()
+
+    for entity in all_sprites:
+        screen.blit(entity.surf, entity.rect)
+
+    # Flip the display
+    pygame.display.flip()
+
+pygame.quit()

player.py

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+import pygame
+from settings import SCREEN_HEIGHT, SCREEN_WIDTH
+from pygame.locals import (
+    K_UP,
+    K_DOWN,
+    K_LEFT,
+    K_RIGHT,
+    K_ESCAPE,
+    KEYDOWN,
+    QUIT,
+)
+
+
+class Player(pygame.sprite.Sprite):
+    def __init__(self):
+        super().__init__()
+        self.surf = pygame.Surface((40, 40))
+        self.surf.fill((0, 250, 0))
+        self.rect = self.surf.get_rect()
+        
+    def update(self, pressed_keys):
+        if pressed_keys[K_UP]:
+            self.rect.move_ip(0, -2)
+        if pressed_keys[K_DOWN]:
+            self.rect.move_ip(0, 2)
+        if pressed_keys[K_LEFT]:
+            self.rect.move_ip(-2, 0)
+        if pressed_keys[K_RIGHT]:
+            self.rect.move_ip(2, 0)
+
+        if self.rect.left < 0:
+            self.rect.left = 0
+        if self.rect.right > SCREEN_WIDTH:
+            self.rect.right = SCREEN_WIDTH
+        if self.rect.top <= 0:
+            self.rect.top = 0
+        if self.rect.bottom >= SCREEN_HEIGHT:
+            self.rect.bottom = SCREEN_HEIGHT

settings.py

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+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 600