# 导入所需库
from tkinter import *
from tkinter import ttk
from tkinter import messagebox

# 创建 tkinter 窗口实例
win = Tk()

# 设置 tkinter 窗口大小
win.geometry("700x350")

def display_msg():
   messagebox.showinfo("Message", "Hello There! Greeting from TutorialsPoint.")

# 添加一个 Button 小部件
b1 = ttk.Button(win, text="Click Me", command=display_msg)
b1.pack(pady=30)
b1.invoke()

win.mainloop()