导入 tkinter 的“messagebox”模块时，“import tkinter.messagebox”语法是否不起作用？

Question

Since the "messagebox" is a module in the "tkinter" package, why do I have to use

from tkinter import messagebox

instead of

import tkinter.messagebox

I was under the impression that to import a module within a package I would have to use the following syntax:

import package_name.module_name 

Thanks for your help.

Answer 1

Importing tkinter.messagebox does work (at least in should, and does in 3.4, maybe there might be a bug in other releases) , but it is imported as tkinter.messagebox , which is tedious and lengthy to write, and if the rest of tkinter is being used, it is pointless to do, seeing as tkinter.messagebox will have already been indirectly imported. So generally from tkinter import messagebox is considered easier, and does not loose much, if any readability.

Answer 2

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'