【问题标题】:__init__() got unexpected keyword argument 'y'__init__() 得到了意外的关键字参数 'y'
【发布时间】:2015-07-28 06:06:12
【问题描述】:

我正在关注《绝对初学者的 Python 编程》这本书,并决定通过制作自己的游戏来测试我的一些技能。游戏基本上是“不要被飞刺击中”,我遇到了一个问题。使用此代码运行它时:

class Player(games.Sprite):
    """The player that must dodge the spikes."""

    def update(self):
        """Move to the mouse."""
        self.x = games.mouse.x
        self.y = games.mouse.y
        self.check_collide()

    def check_collide(self):
        """Check for a collision with the spikes."""
        for spike in self.overlapping_sprites:
            spike.handle_collide()


def main():


    pig_image = games.load_image("Mr_Pig.png")
    the_pig = Player(image = pig_image,
                     x = games.mouse.x,
                     y = games.mouse.y)
    games.screen.add(the_pig)
    games.mouse.is_visible = False
    games.screen.event_grab = True

    games.screen.mainloop()

main()

我没问题。但是当我想使用 'init' 时,就像在这段代码中一样:

class Player(games.Sprite):
    """The player that must dodge the spikes."""

    def update(self):
        """Move to the mouse."""
        self.x = games.mouse.x
        self.y = games.mouse.y
        self.check_collide()

    def check_collide(self):
        """Check for a collision with the spikes."""
        for spike in self.overlapping_sprites:
            spike.handle_collide()

    def __init__(self):
        """A test!"""
        print("Test.")


def main():

    pig_image = games.load_image("Mr_Pig.png")
    the_pig = Player(image = pig_image,
                     x = games.mouse.x,
                     y = games.mouse.y)
    games.screen.add(the_pig)
    games.mouse.is_visible = False
    games.screen.event_grab = True

    games.screen.mainloop()

main()

运行游戏时出现此错误:

File "run.py", line 85, in main
    y = games.mouse.y)
TypeError: __init__() got an unexpected keyword argument 'y'.

【问题讨论】:

  • 请仅发布相关代码。没有人会检查所有这些代码并为您调试,请仅粘贴足以重现问题的相关代码。

标签: python pygame livewires


【解决方案1】:

这一行:

the_pig = Player(image = pig_image,
                 x = games.mouse.x,
                 y = games.mouse.y)

是(某种)等价于:

the_pig = Player.__init__(image = pig_image,
                 x = games.mouse.x,
                 y = games.mouse.y)

这意味着您的__init__ 应该接受参数imagexy,但您已将其定义为:

def __init__(self):
    """A test!"""
    print("Test.")

如果你想简单地传递所有参数,你可以这样做:

def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    """A test!"""
    print("Test.")

这使用* and ** 语法来获取所有参数和关键字参数,然后使用super 使用这些参数调用超类__init__

替代方案(更多工作)是:

def __init__(self, image, x, y):
    super().__init__(image=image, x=x, y=y)
    """A test!"""
    print("Test.")

【讨论】:

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