Tkinter MessageBox 给出错误

Question

In a GUI program written in Python 3.5 I use the Tkinter module. I define a function to call the MessageBox as follows:

def callAbout():
    messagebox.showinfo(title = "About", message = "My Window")

When I try to execute, I get the following error message:

Exception in Tkinter callback
Traceback (most recent call last):
  [PATH]
    return self.func(*args)
  File "tk-error.py", line 4, in callAbout
    messagebox.showinfo(title = "About", message = "My Window")
NameError: name 'messagebox' is not defined

It seems that the program cannot find

messagebox

but I wonder why, since I imported the whole module with

from tkinter import *

Please, ask if you need the complete code. Thanks in advance for your help.

Added: Here follows the whole code.

from tkinter import *

def callAbout():
    messagebox.showinfo(title = "About", message = "My Window")

win = Tk()

win.geometry('300x300')
win.title("My First Window")

bar_menu = Menu(win)

menu_about = Menu(bar_menu, tearoff = 0)
bar_menu.add_cascade(label = "About", menu = menu_about)
menu_about.add_command(label = "About", command = callAbout)

win.config(menu = bar_menu)

win.mainloop()

Answer 1

I had same problem. I changed the code like this. simply...

---

from tkinter import *

from tkinter import messagebox

---

Answer 2

Change messagebox.showinfo to showinfo and add from tkinter.messagebox import showinfo

from tkinter import *
from tkinter.messagebox import showinfo


def callAbout():
    showinfo(title="About", message="My Window")


win = Tk()

win.geometry('300x300')
win.title("My First Window")

bar_menu = Menu(win)

menu_about = Menu(bar_menu, tearoff=0)
bar_menu.add_cascade(label="About", menu=menu_about)
menu_about.add_command(label="About", command=callAbout)

win.config(menu=bar_menu)

win.mainloop()

Output:

Answer 3

You can import and use the messagebox module by using an alias:

import tkinter.messagebox as tkmb

Here is your code after making changes,

import tkinter as tk
import tkinter.messagebox as tkmb

def callAbout():
    tkmb.showinfo(title = "About", message = "My Window")

win = tk.Tk()

win.geometry('300x300')
win.title("My First Window")

bar_menu = tk.Menu(win)

menu_about = tk.Menu(bar_menu, tearoff = 0)
bar_menu.add_cascade(label = "About", menu = menu_about)
menu_about.add_command(label = "About", command = callAbout)

win.config(menu = bar_menu)

win.mainloop()

Answer 4

messagebox, along with some other modules like filedialog, does not automatically get imported when you import tkinter. Import it explicitly, using as and/or from as desired. check below 3 examples for better clarification-

    >>> import tkinter
    >>> tkinter.messagebox.showinfo(message='hi')

Traceback (most recent call last): File "", line 1, in AttributeError: 'module' object has no attribute 'messagebox'

.

    >>> import tkinter.messagebox
    >>> tkinter.messagebox.showinfo(message='hi')

'ok'

.

 >>> from tkinter import messagebox
    >>> messagebox.showinfo(message='hi')

'ok'