NameError：未定义全局名称“messagebox” - 控制台模式

Question

我已经导入了 tkinter.messagebox，当我按 F5 并在 IDLE 上测试时，我的程序运行顺利。 但是，当应显示消息框时，我的程序无法在控制台上运行，并且出现错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\lib\tkinter\__init__.py", line 1456, in __call__
    return self.func(*args)
  File "U:\my documents\6th form\A2\Computing\F454\Code and Prototyping\trackeve
nts.py", line 204, in validation
    messagebox.showerror("Data invalid", "The data you have entered is invalid.
Please make sure you have submitted it correctly.")
NameError: global name 'messagebox' is not defined

我导入消息框和代码部分（如果需要）：

import tkinter.messagebox

def validation():
(...)
elif completedValidation == False:
    messagebox.showerror("Data invalid", "The data you have entered is invalid. Please make sure you have submitted it correctly.")

Answer 1

如果您

import tkinter.messagebox

，则必须这样称呼它：用

tkinter.messagebox

。如果您想将其别名为

messagebox

，则需要

from tkinter import messagebox

。

Answer 2

试试这个

import Tkinter
import tkMessageBox
#rest of the code and replace the below line
tkMessageBox.showerror("Data invalid", "The data you have entered is invalid. Please make sure you have submitted it correctly.")

Answer 3

如果 tkinter 模块是最新的，您可以尝试此操作。

from tkinter import messagebox
messagebox.showinfo("abc", "def")