如何用Tkinker创建一个字母计数器？

import tkinter as tk

root = tk.Tk()
root.title("字母计数器")

count = 0
count_label = tk.Label(root, text="计数器：0")
count_label.pack()

def increase_count():
    global count
    count += 1
    count_label.config(text="计数器：" + str(count))

increase_button = tk.Button(root, text="增加", command=increase_count)
increase_button.pack()

def reset_count():
    global count
    count = 0
    count_label.config(text="计数器：0")

reset_button = tk.Button(root, text="重置", command=reset_count)
reset_button.pack()

root.mainloop()