“MyGrid”对象没有“”pressed“”属性“”

Question

所以我最近开始使用python，想用kivy做一些应用程序，我正在学习一个教程，这是我试着再看一遍教程的代码，但是我找不到任何东西，所以我需要一些帮助。我还尝试了复制和粘贴，这样我就不会遗漏任何输入内容。

import kivy
kivy.require('1.11.1') # replace with your current kivy version !

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


class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super(MyGrid, self).__init__(**kwargs)
        self.cols = 1

        self.inside = GridLayout()
        self.inside.cols = 2

        self.inside.add_widget(Label(text="First Name: "))
        self.name = TextInput(multiline=False)
        self.inside.add_widget(self.name)

        self.inside.add_widget(Label(text="Last Name: "))
        self.lastName = TextInput(multiline=False)
        self.inside.add_widget(self.lastName)

        self.inside.add_widget(Label(text="Email: "))
        self.email = TextInput(multiline=False)
        self.inside.add_widget(self.email)

        self.add_widget(self.inside)

        self.submit = Button(text="Submit", font_size=40)
        self.submit.bind(on_press= self.pressed)
        self.add_widget(self.submit)

def pressed(self, instance):
    print("Pressed")

class MyApp(App):
    def build(self):
        return MyGrid()


if __name__ == '__main__':
    MyApp().run()

Answer 1

缩进有问题。您的pressed现在不在MyGrid类中。您可能希望它是该类中的方法。如下所示：

class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super(MyGrid, self).__init__(**kwargs)
        self.cols = 1

        self.inside = GridLayout()
        self.inside.cols = 2

        self.inside.add_widget(Label(text="First Name: "))
        self.name = TextInput(multiline=False)
        self.inside.add_widget(self.name)

        self.inside.add_widget(Label(text="Last Name: "))
        self.lastName = TextInput(multiline=False)
        self.inside.add_widget(self.lastName)

        self.inside.add_widget(Label(text="Email: "))
        self.email = TextInput(multiline=False)
        self.inside.add_widget(self.email)

        self.add_widget(self.inside)

        self.submit = Button(text="Submit", font_size=40)
        self.submit.bind(on_press= self.pressed)
        self.add_widget(self.submit)

    #This is now indented under MyGrid class
    def pressed(self, instance):
        print("Pressed")

class MyApp(App):
    def build(self):
        return MyGrid()