如何调用在不同函数中定义的Tkinter标签？

import tkinter as tk

root = tk.Tk()

# 定义全局变量
label = None

def create_label():
    global label
    label = tk.Label(root, text="Hello World")
    label.pack()

def update_label():
    global label
    label.config(text="Updated Text")

create_label()
update_label()

root.mainloop()

import tkinter as tk

root = tk.Tk()

def create_label():
    label = tk.Label(root, text="Hello World")
    label.pack()
    return label

def update_label(label):
    label.config(text="Updated Text")

my_label = create_label()
update_label(my_label)

root.mainloop()