Python Message Box Without huge library dependency

You can use the ctypes library, which comes installed with Python:

import ctypes
MessageBox = ctypes.windll.user32.MessageBoxW
MessageBox(None, 'Hello', 'Window title', 0)

Above code is for Python 3.x. For Python 2.x, use MessageBoxA instead of MessageBoxW as Python 2 uses non-unicode strings by default.

There are also a couple prototyped in the default libraries without using ctypes.

Simple message box:

import win32ui
win32ui.MessageBox("Message", "Title")

Other Options

if win32ui.MessageBox("Message", "Title", win32con.MB_YESNOCANCEL) == win32con.IDYES:
    win32ui.MessageBox("You pressed 'Yes'")

There's also a roughly equivalent one in win32gui and another in win32api. Docs for all appear to be in C:\Python{nn}\Lib\site-packages\PyWin32.chm

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