小编Joh*_*ruz的帖子

我有个问题.我认为一个类可以基于一个对象或以前定义类.当我将其更改为类Application(对象)时:它不起作用.你能告诉我为什么它不起作用,为什么下面的代码有效或为什么类应用程序(框架)有效？Frame不是先前定义的对象而不是对象.对不起我的英语不好.这是我的代码:

# Lazy Buttons
# Demonstrates using a class with tkinter

from tkinter import *

class Application(Frame): #
    """ A GUI application with three buttons. """
    def __init__(self, master):
        super(Application, self).__init__(master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        """  Create three buttons that do nothing. """
        # create the first Button
        self.bttn1 = Button(self, text= "I do nothing.")
        self.bttn1.grid()

        # create second button
        self.bttn2 = Button(self)
        self.bttn2.grid()
        self.bttn2.configure(text="Me too!")

        # create third button
        self.bttn3 = Button(self)
        self.bttn3.grid()
        self.bttn3["text"] = "Same here!"

# main …