python - 无法弄清楚为什么我收到语法错误

问题描述

我正在按照教程编写游戏，据我所知，我的代码与教程中的代码相同，我已经为此工作了大约 45 分钟，并检查了两次代码，但这里是代码

import pygame
import math
import random

# Intialize the Pygame
pygame.init()

# Create the Screen
screen = pygame.display.set_mode((800, 600))

# Background
background = pygame.image.load("space.png")

# Title and Icon
pygame.display.set_caption("Space Invaders")
icon = pygame.image.load("alien.png")
pygame.display.set_icon(icon)

# Player
playerImg = pygame.image.load("player.png")
playerX = 370
playerY = 480
playerX_change = 0

# Enemy
enemyImg = []
enemyX = []
enemyY = []
enemyX_change = []
enemyY_change = []
num_of_enemies = 6

for i in range(num_of_enemies):
    enemyImg.append(pygame.image.load("enemy.png"))
    enemyX.append(random.randint(0, 736))
    enemyY.append(random.randint(50, 150))
    enemyX_change.append(4)
    enemyY_change.append(30)

# Bullet

# Ready - You can't see the bullet on the screen

# Fire_ The bullet is currently moving
bulletImg = pygame.image.load("bullet.png")
bulletX = 0
bulletY = 480
bulletX_change = 0
bulletY_change = 15
bullet_state = "ready"
score = 0


def player(x, y):
    screen.blit(playerImg, (x, y))


def enemy(x, y, i):
    screen.blit(enemyImg[i], (x, y))


def fire_bullet(x, y):
    global bullet_state
    bullet_state = "fire"
    screen.blit(bulletImg, (x + 16, y + 10))


def isCollision(enemyX, enemyY, bulletX, bulletY):
    distance = math.sqrt(math.pow(enemyX - bulletX, 2) + (math.pow(enemyY - bulletY, 2))
    if distance < 27:
        return True
    else:
        return False


# Game Loop
running = True
while running:

    # RGB - Red, Green, Blue
    screen.fill((0, 0, 0))
    # Background image
    screen.blit(background, (0, 0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        # If keystroke is pressed check whether its right or left
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                playerX_change = -5
            if event.key == pygame.K_RIGHT:
                playerX_change = 5
            if event.key == pygame.K_SPACE:
                if bullet_state is "ready":
                    bulletX = playerX
                    fire_bullet(bulletX, bulletY)

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                playerX_change = 0

    # Checking for boundaries for space ship
    playerX += playerX_change

    if playerX <= 0:
        playerX = 0
    elif playerX >= 736:
        playerX = 736

    # Enemy movement
    for i in range(num_of_enemies):
        enemyX[i] += enemyX_change[i]
        if enemyX[i] <= 0:
            enemyX_change[i] = 4
            enemyY[i] += enemyY_change[i]
        elif enemyX[i] >= 736:
            enemyX_change[i] = -4
            enemyY[i] += enemyY_change[i]

        # Collision
        collision = isCollision(enemyX[i], enemyY[i], bulletX, bulletY)
        if collision:
            bulletY = 480
            bullet_state = "ready"
            score += 1
            print(score)
            enemyX[i] = random.randint(0, 736)
            enemyY[i] = random.randint(50, 150)

        enemy(enemyX[i], enemyY[i], i)

    # Bullet Movement
    if bulletY <= 0:
        bulletY = 480
        bullet_state = "ready"

    if bullet_state is "fire":
        fire_bullet(bulletX, bulletY)
        bulletY -= bulletY_change

    player(playerX, playerY)

    pygame.display.update()

这是我得到的错误：

     line 70
        if distance < 27:
                        ^
    SyntaxError: invalid syntax

Process finished with exit code 1

我是 python 新手，所以我忘记了这可能是一些愚蠢的事情，但我无法弄清楚这一点。

标签： python

python - 无法弄清楚为什么我收到语法错误

问题描述

解决方案

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