是否删除tkinter中类中的实例化对象？

import tkinter as tk

class MyClass:
    def __init__(self):
        self.label = tk.Label(text="Hello, World!")
        self.label.pack()

    def delete_instance(self):
        self.label.destroy()
        self.label = None

# 创建一个实例
my_instance = MyClass()

# 删除实例
my_instance.delete_instance()