Tkinter GUI计数器不计入Python

import tkinter as tk

class CounterApp:
    def __init__(self, root):
        self.count = 0

        self.label = tk.Label(root, text="Count: 0")
        self.label.pack()

        self.increment_button = tk.Button(root, text="Increment", command=self.increment)
        self.increment_button.pack()

        self.decrement_button = tk.Button(root, text="Decrement", command=self.decrement)
        self.decrement_button.pack()

    def increment(self):
        self.count += 1
        self.label.config(text="Count: {}".format(self.count))

    def decrement(self):
        self.count -= 1
        self.label.config(text="Count: {}".format(self.count))

root = tk.Tk()
app = CounterApp(root)
root.mainloop()