python - kivy __init__ 采用 1 个位置参数，但给出了 2 个

Question

所以我正在为一个学校项目学习 Kivy，但在测试 Buttons 时遇到错误。这是我的代码:

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.clock import Clock
from kivy.uix.button import Button


class übung(GridLayout):

    def lol(instance):
         label.disabled = False


    def __init__(self):
        super(übung, self).__init__
        self.cols = 2
        self.label = Label ("Ehrm ... lol")
        label.disabled = True
        self.btn1 = Button(text="Hello world 1")
        self.btn1.bind(on_press=lol)
        self.btn2 = Button(text="Hello world 2")
        self.btn2.bind(on_press=lol)

class App(App):
     def build(self):
        return übung()


if __name__ == "__main__":
    App().run()

我得到的错误在标题中(init 接受 1 个后置参数，但给出了 2 个)。它应该是两个按钮，如果你按下一个，它会说 ehrm ... 大声笑。正如我所说，它仅用于测试目的。

提前致谢，我

Answer 1

你有几个错误。您显示的错误是因为您必须按名称将参数 (text) 传递给 Label 构造函数:

self.label = Label (text="Ehrm ... lol")

您的代码应如下所示:

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.button import Button


class übung(GridLayout):
    def __init__(self, **kwargs):
        super(übung, self).__init__(**kwargs)
        self.cols = 2
        self.label = Label(text = "Ehrm ... lol")
        self.label.disabled = True
        self.btn1 = Button(text="Hello world 1")
        self.btn1.bind(on_press=self.lol)
        self.btn2 = Button(text="Hello world 2")
        self.btn2.bind(on_press=self.lol)

        self.add_widget(self.label)
        self.add_widget(self.btn1)
        self.add_widget(self.btn2)

    def lol(self,  event):
        self.label.disabled = False

class App(App):
     def build(self):
        return übung()


if __name__ == "__main__":
    App().run()