What is the error: TypeError: argument 1 must be pygame.Surface, not None?

  pygame, python, python-3.x

When I ran my code, it says: TypeError: argument 1 must be pygame.Surface, not None

Here is the code:

import os
import time
import random
pygame.font.init()

WIDTH, HEIGHT = 750, 750
WIN = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Space shooter")

RED_SPACE_SHIP = pygame.image.load("pixel_ship_red_small.png")
GREEN_SPACE_SHIP = pygame.image.load("pixel_ship_green_small.png")
BLUE_SPACE_SHIP = pygame.image.load("pixel_ship_blue_small.png")

YELLOW_SPACE_SHIP = pygame.image.load("pixel_ship_yellow.png")

RED_LASER = pygame.image.load("pixel_laser_red.png")
GREEN_LASER = pygame.image.load("pixel_laser_green.png")
BLUE_LASER = pygame.image.load("pixel_laser_blue.png")
YELLOW_LASER = pygame.image.load("pixel_laser_yellow.png")

BG = pygame.transform.scale(pygame.image.load("background-black.png"), (WIDTH, HEIGHT))

class Laser:
    def __init__(self, x, y, img):
        self.x = x
        self.y = y
        self.img = img
        self.mask = pygame.mask.from_surface(self.img)

    def draw(self, window):
        window.blit(self.img, (self.x, self.y))

    def move(self, vel):
        self.y += vel

    def off_screen(self, height):
        return not(self.y < height and self.y > 0)

    def collision(self, obj):
        return collide(self, obj)

class Ship():
    COOLDOWN = 30
    
    def __init__(self, x, y, health = 100):
        self.x = x
        self.y = y
        self.health = health
        self.ship_img = None
        self.laser_img = None
        self.lasers = []
        self.cool_down_counter = 0

    def draw(self, window):
        window.blit(self.ship_img, (self.x, self.y))
        for laser in self.lasers:
            laser.draw(window)

    def move_lasers(self, vel, objs):
        for laser in self.lasers:
            laser.move(vel)
            if laser.off_sreen(HEIGHT):
                self.lasers.remove(laser)
            else:
                for obj in objs:
                    if laser.collision(obj):
                        objs.remove(objs)
                        self.lasers.remove(laser)

    def cooldown(self):
        if self.cool_down_counter >= self.COOLDOWN:
            self.cool_down_counter = 0
        elif self.cool_down_counter >= 0:
            self.cool_down_counter += 1

    def shoot(self):
        if self.cool_down_counter == 0:
            laser = Laser(self.x, self.y, self.laser_img)
            self.lasers.append(laser)
            self.cooldown_counter = 1

    def get_width(self):
        return self.ship_img.get_width()

    def get_height(self):
        return self.ship_img.get_height()

class Player(Ship):
    def __init__(self, x, y, health = 100):
        super().__init__(x, y, health)
        self.ship_img = YELLOW_SPACE_SHIP
        self.ship_laser_img = YELLOW_LASER
        self.mask = pygame.mask.from_surface(self.ship_img)
        self.max_health = 100

class Enemy(Ship):
    COLOR_MAP = {
        "red": (RED_SPACE_SHIP, RED_LASER),
        "green": (GREEN_SPACE_SHIP, GREEN_LASER),
        "blue": (BLUE_SPACE_SHIP, BLUE_LASER)
        }
    
    def __init__(self, x, y, color, health = 100):
        super().__init__(x, y, health)
        self.ship_img, self.laser_img = self.COLOR_MAP[color]
        self.mask = pygame.mask.from_surface(self.ship_img)

    def move(self, vel):
        self.y += vel

def collide(obj1, obj2):
    offset_x = obj2.x - obj1.x
    offset_y = obj2.y - obj1.y
    return obj1.mask.overlap(obj2, (offset_x, offset_y)) != None

def main():
    run = True
    FPS = 60
    level = 0
    lives = 5
    main_font = pygame.font.SysFont("comicsans", 50)
    lost_font = pygame.font.SysFont("comicsans", 60)

    enemies = []
    wave_length = 5
    enemy_vel = 1
    
    player_vel = 5
    laser_vel = 4
    
    player = Player(300, 650)
    
    clock = pygame.time.Clock()

    lost = False
    lost_count = 0

    def redraw_window():
        WIN.blit(BG, (0, 0))
        lives_label = main_font.render(f"Lives: " + str(lives), 1, (255,255,255))
        level_label = main_font.render(f"Level: " + str(level), 1, (255,255,255))

        WIN.blit(lives_label, (10, 10))
        WIN.blit(level_label, (WIDTH - level_label.get_width() - 10, 10))

        player.draw(WIN)

        for enemy in enemies:
            enemy.draw(WIN)

        if lost == True:
            lost_label = lost_font.render("You Lost!!", 1, (255, 255, 255))
            WIN.blit(lost_label, (WIDTH / 2 - lost_label.get_width() / 2, 350))
        
        pygame.display.update()

    while run == True:
        clock.tick(FPS)
        redraw_window()
        
        if lives <= 0 or player.health <= 0:
            lost = True
            lost_count += 1

        if lost == True:
            if lost_count > FPS * 3:
                run = False
                pygame.quit()
            else:
                continue

        if len(enemies) == 0:
            level += 1
            wave_length += 5
            for i in range(wave_length):
                enemy = Enemy(random.randrange(50, WIDTH - 100), random.randrange(-1500, 100), random.choice(["red", "blue", "green"]))
                enemies.append(enemy)
                
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
                pygame.quit()

        keys = pygame.key.get_pressed()
        if keys[pygame.K_a] and player.x - player_vel > 0:
            player.x -= player_vel
        if keys[pygame.K_d] and player.x + player_vel + player.get_width() < WIDTH:
            player.x += player_vel
        if keys[pygame.K_w] and player.y - player_vel > 0:
            player.y -= player_vel
        if keys[pygame.K_s] and player.y + player_vel + player.get_height() < HEIGHT:
            player.y += player_vel
        if keys[pygame.K_SPACE]:
            player.shoot()

        for enemy in enemies[:]:
            enemy.move(enemy_vel)
            enemy.move_lasers(laser_vel, player)
            if enemy.y + enemy.get_height() > HEIGHT:
                lives -= 1
                enemies.remove(enemy)

        player.move_lasers(laser_vel, enemies)
            
main()

Everything works fine, until I pressed spacebar, in which case it should mostly shoot lasers. But instead, it says: TypeError: argument 1 must be pygame.Surface, not None. The question is, how do I fix this?

Not sure why this is happening 🙁

Source: Python-3x Questions

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