from tkinter import *
from tkinter import messagebox
def myMsg():
    messagebox.showinfo("My Message Box","小伙子，下午好!")

root =Tk()
root.title("messagebox练习")
# root.geometry("300*160")

Button(root,text="按钮",command=myMsg).pack()

root.mainloop()

from tkinter import *
from tkinter import messagebox

def myMsg1():
    ret=messagebox.askretrycancel("Text1","安装失败，再试一次？")
    print("安装失败",ret)
def myMsg2():
    ret=messagebox.askyesnocancel("Text2","编辑成功，是或否或取消")
    print("编辑完成",ret)

root =Tk()
root.title("messagebox练习")

Button(root,text="安装失败",command=myMsg1).pack()
Button(root,text="编辑完成",command=myMsg2).pack()

root.mainloop()