向 init 和创建实例添加参数

编程问答 2022-05-17

问题描述

我想让我的班级的两个变量成为动态的，因此它们具有不同的值，具体取决于为游戏选择的难度。我是不是在 __init__ 中做错了什么或者是哪里出了问题？如果我从 speed_top_border,speed_bottom_border 中删除两个参数 __init__ 并输入静态值，一切正常。

# Obstacle class
class Obstacle(object):

    # Init
    def __init__(self,speed_top_border,speed_bottom_border):
        self.obstacleImg = 'rock.png'
        self.obstacleX = random.randint(700,800)
        self.obstacleY = random.randint(0,ScreenHeight - 64)
        self.obstacleX_change = random.uniform(self.speed_top_border,self.speed_bottom_border)

# Keep window running (Infinite-Loop)
running = 1

# Menu-loop
while running == 1:

    # Insert Background
    screen1.blit(background,(0,0))

    for event in pygame.event.get():

        # Quit game
        if event.type == pygame.QUIT:
            running = 0

        if event.type == pygame.KEYDOWN:

            # Difficulty easy
            if event.key == pygame.K_1:
                speed_top_border = -1
                speed_bottom_border = -0.5

            # Start game
            if event.key == pygame.K_SPACE:
                running = 2

# Game While-Loop
    while running == 2:

# Creation of instancet of class obstacle each iteration
        if timer1_current - timer1_start >= interval:
            timer1_start = time.time()  # Timer of start set to current time
            obstacle = Obstacle(speed_top_border,speed_bottom_border)  # Create instance of class obstacle
            obstacle_list.append(obstacle)  # Append instance to list
            print(obstacle)  # Print created instance for check
            score += 100 * score_multiplier  # Increase score

错误信息

Traceback (most recent call last):
  File "C:\Users\Timo\PycharmProjects\2DFlugzeugspiel\main.py",line 221,in <module>
    obstacle = Obstacle(speed_top_border,speed_bottom_border)  # Create instance of class obstacle
  File "C:\Users\Timo\PycharmProjects\2DFlugzeugspiel\main.py",line 89,in __init__
    self.obstacleX_change = random.uniform(self.speed_top_border,self.speed_bottom_border)
AttributeError: 'Obstacle' object has no attribute 'speed_top_border'

解决方法

您从未在 self.speed_top_border 中定义 self.speed_bottom_border、__init__，而是尝试在 self.obstacleX_change = random.uniform(self.speed_top_border,self.speed_bottom_border) 中使用它们

如果你想拥有这些属性 - 在使用它们之前定义它们

class Obstacle(object):

    def __init__(self,speed_top_border,speed_bottom_border):
        self.obstacleImg = 'rock.png'
        self.obstacleX = random.randint(700,800)
        self.obstacleY = random.randint(0,ScreenHeight - 64)
        self.speed_top_border = speed_top_border
        self.speed_bottom_border = speed_bottom_border
        self.obstacleX_change = random.uniform(self.speed_top_border,self.speed_bottom_border)
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