Python TypeError报错求助：Button() takes no arguments

错误信息 #

"C:\Users\Max Breier\AppData\Local\Programs\Python\Python310\python.exe" "C:\Users\Max Breier\PycharmProjects\pythonProject\JaR\master.py" 
pygame 2.1.2 (SDL 2.0.18, Python 3.10.2)
Hello from the pygame community. https://www.pygame.org/contribute.html
Traceback (most recent call last):
  File "C:\Users\Max Breier\PycharmProjects\pythonProject\JaR\master.py", line 35, in <module>
    resume_button = button.Button(304, 125, resume_img, 1)
TypeError: Button() takes no arguments

Process finished with exit code 1

创建Button实例的代码 #

resume_button = button.Button(304, 125, resume_img, 1)
options_button = button.Button(297, 250, options_img, 1)
quit_button = button.Button(336, 375, quit_img, 1)
video_button = button.Button(226, 75, video_img, 1)
audio_button = button.Button(225, 200, audio_img, 1)
keys_button = button.Button(246, 325, keys_img, 1)
back_button = button.Button(332, 450, back_img, 1)

Button类的原始代码 #

class Button():
    def _init_(self, x, y, image, scale):
        width = image.get_width()
        height = image.get_height()
        self.image = pygame.transform.scale(image, (int(width * scale), int(height * scale)))
        self.rect = self.image.get_rect()
        self.rect.topleft = (x, y)
        self.clicked = False

    def draw(self, surface):
        action = False
        pos = pygame.mouse.get_pos()

        if self.rect.collidepoint(pos):
            if pygame.mouse.get_pressed()[0] == 1 and self.clicked == False:
                self.clicked = True
                action = True

        if pygame.mouse.get_pressed()[0] == 0:
            self.clicked = False

        surface.blit(self.image, (self.rect.x, self.rect.y))

        return action

解决方案 #

问题出在Button类的构造函数定义上：Python要求类的构造函数必须以双下划线开头和结尾，即__init__，而你写的是_init_（单下划线），这会让Python无法识别这是构造函数，转而使用默认的无参构造函数，导致传参时报错。

只需要把构造函数的名字改成__init__即可，修改后的代码如下：

class Button():
    def __init__(self, x, y, image, scale):
        width = image.get_width()
        height = image.get_height()
        self.image = pygame.transform.scale(image, (int(width * scale), int(height * scale)))
        self.rect = self.image.get_rect()
        self.rect.topleft = (x, y)
        self.clicked = False

    def draw(self, surface):
        action = False
        pos = pygame.mouse.get_pos()

        if self.rect.collidepoint(pos):
            if pygame.mouse.get_pressed()[0] == 1 and self.clicked == False:
                self.clicked = True
                action = True

        if pygame.mouse.get_pressed()[0] == 0:
            self.clicked = False

        surface.blit(self.image, (self.rect.x, self.rect.y))

        return action

内容的提问来源于stack exchange，提问作者Max