import tkinter as tk

from my_package.App_window import AppWindow


class TrainingApp(AppWindow):
    def __init__(self,width,height):
        super().__init__(width,height)
        self.listbox = None
        self.entry = None
        self.button = None

    def on_click(self):
        self.listbox.insert(tk.END,self.entry.get())
        self.entry.delete(0,tk.END)

    def init_widgets(self):
        self.listbox = tk.Listbox(self.root)
        self.listbox.pack()
        self.entry = tk.Entry(self.root)
        self.entry.pack()
        self.button = tk.Button(self.root, text="save", command=self.on_click)
        self.button.pack()

t = TrainingApp(500,500)
t.run()