tkinter面向对象的多个窗口

Question

我是Tkinter OOP的新手，正在尝试开发一个包含3个窗口的应用程序（我使用过Toplevel())。

MainPage plan_but应该能够在ForGeeks页面上显示num_events，并且只要num_events发生变化就可以进行更改。

我尝试过text = text = str(self.show_geek())，但是它没有改变，运行代码时，极客窗口会打开。

有人可以帮我吗？

from tkinter import *

from re import findall

from web_doc_downloader import download

# ...

class MainPage:

    def __init__(self):
        self.mainwindow = Tk()
        # self.geek_obj = ForGeeks(Toplevel(self.mainwindow))
        self.logo = PhotoImage(file='logo.gif')
        background_width = self.logo.width()
        background_height = self.logo.height()
        # resize the window
        self.mainwindow.geometry('%sx%s' % (background_width, background_height))
        # Canvas to put image in
        self.canvas = Canvas(width=background_width, height=background_height)
        self.canvas.pack(side=TOP, fill=BOTH, expand=YES)
        self.canvas.create_image(0, 0, image=self.logo, anchor=NW)
        #Print plans button
        self.plan_but = Button(self.canvas, text = str(self.show_geek()))
        self.plan_but.place(height = 40, relwidth = 0.25, rely = 0.05, relx = 0.375)

# ...

    def show_geeks(self):
        self.geekwindow = Toplevel(self.mainwindow)
        self.geekapp = ForGeeks(self.geekwindow)
        return self.geekapp.num_events


class ForGeeks:

    def __init__(self, geek_app, bg = 'blue'):
        self.geek_app = geek_app
        self.geek_app['bg']= bg
        self.title = Label(self.geek_app, text = 'Events for Geeks' , font = ('Times',20, 'bold'), height = 3, width = 50, bg=bg)
        self.title.pack(expand = YES, anchor = N)
        self.event_list = Checkbar(self.geek_app, geek, bg = bg)
        self.event_list.pack(side=TOP)
        self.num_events = self.events_count()

    def events_count(self):
        return(self.event_list.count())