在tkinter类中创建另一个窗口

import tkinter as tk

class MainWindow(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("主窗口")
        self.button = tk.Button(self, text="打开新窗口", command=self.open_new_window)
        self.button.pack()

    def open_new_window(self):
        new_window = NewWindow(self)
        new_window.title("新窗口")

class NewWindow(tk.Toplevel):
    def __init__(self, master):
        super().__init__(master)
        self.label = tk.Label(self, text="这是一个新窗口")
        self.label.pack()

if __name__ == "__main__":
    main_window = MainWindow()
    main_window.mainloop()