python - 名称错误 : global name 'messagebox' is not defined - CONSOLE MODE

Question

我导入了 tkinter.messagebox，当我按 F5 并在 IDLE 上测试时，我的程序运行顺利。 但是，当应该显示消息框时，我的程序没有在控制台上运行，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

如果需要，我导入消息框和代码部分:

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，您必须这样引用它:with tkinter.messagebox。如果你只想将它别名为 messagebox，你需要 from tkinter import messagebox。