python tkinter messagebox

 """messagebox消息框"""
 import tkinter as tk
 #导入messagebox
 import tkinter.messagebox as messagebox
 window = tk.Tk()
 window.title("My Window")
 window.geometry("400x400")
 var = tk.StringVar()
 var.set("Hello world")
 label = tk.Label(window,textvariable=var,font=("斜体",15),width=20,height=2,bg="black",fg="green")
 label.pack()
 def hit_me():
     global label #使用全局变量
     messagebox.showinfo(title="info",message="提示")
     messagebox.showwarning(title="warning",message="警告")
     messagebox.showerror(title="error",message="错误")
     """return yes or no"""
     question = messagebox.askquestion(title="question",message="问题")
     if question == "yes":
         var.set("you selection yes")
     else:
         var.set("you selection no")
     """return True or False"""
     askyesno = messagebox.askyesno(title="yes or no",message="选择")
     if askyesno == True:
         var.set("You selection True")
     else:
         var.set("You selection False")
     """return True or False"""
     askokcancel = messagebox.askokcancel(title="cancel",message="取消")
     if askokcancel == True:
         var.set("You selection cancel")
     else:
         var.set("You don't selection cancel")
     """return True False None"""
     result = messagebox.askyesnocancel(title="continue",message="Hello World")
     if result == True:
         var.set("You selection yes")
     elif result == False:
         var.set("You selection no")
     elif result == None:
         var.set("You selection cancel")
     """return True False"""
     try_cancel = messagebox.askretrycancel(title="try_cancel",message="Hello World")
     if try_cancel == True:
         var.set("You selection retry")
     else:
         var.set("You selection cancel")
 button = tk.Button(window,text="hit_me",command=hit_me,fg="red",bg="green")
 button.pack()
 window.mainloop()