Python. tkinter图形用户界面设计

import tkinter as tk
root = tk.Tk()
root.title("Hello")
frame = tk.Frame(root)
label1 = tk.Label(frame, text="欢迎进入Python世界!",font = ('宋体',20,'bold'),fg='blue')
label1.pack()
label2 = tk.Label(frame, text="我是18电子1班的张三!",font = ('宋体',14),fg='red')
label2.pack()
frame.pack()
root.mainloop()