Python tk 消息框导入混淆
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tk messagebox import confusion
提问by Apple
I'm just beginning to learn tkinter at the moment, and when importing messagebox I found that I must not really understand import statements.
我现在才刚刚开始学习 tkinter，在导入 messagebox 时，我发现我一定不能真正理解导入语句。
The thing that confuses me is that:
让我困惑的是：
import tkinter as tk
def text_box():
if tk.messagebox.askokcancel("Quit", "Never Mind"):
root.destroy()
root = tk.Tk()
button = tk.Button(root, text="Press the button", command=text_box)
button.pack()
root.mainloop()
compiles fine, but pressing the button gives the error 'module' object has no attribute 'messagebox', while the code:
编译正常，但按下按钮会出现错误'module' object has no attribute 'messagebox'，而代码：
import tkinter as tk
from tkinter import messagebox
...
if messagebox.askokcancel("Quit", "Never Mind"):
...
...works without a hitch.
...工作顺利。
I get a similar error if I import with from tkinter import *.
如果我使用from tkinter import *.
The help for tkinter shows messageboxin the list of PACKAGE CONTENTS, but I just can't load it in the normal way.
tkinter 的帮助显示messagebox在 的列表中PACKAGE CONTENTS，但我无法以正常方式加载它。
So my question is, why...and what is it about importing that I don't understand?
所以我的问题是，为什么......以及我不明白的导入是什么？
Just thought I should mention—the code only works in Python 3, and in Python 2.x messageboxis called tkMessageBoxand is not defined in tkinter.
只是想我应该提到 - 该代码仅在 Python 3 中有效，而在 Python 2.x 中messagebox被调用tkMessageBox且未在tkinter.
采纳答案by mata
tkinter.messageboxis a module, not a class.
tkinter.messagebox是一个模块，而不是一个类。
As it isn't imported in tkinter.__init__.py, you explicitly have to import it before you can use it.
由于它未导入tkinter.__init__.py，因此您必须明确导入它才能使用它。
import tkinter
tkinter.messagebox # would raise an ImportError
from tkinter import messagebox
tkinter.messagebox # now it's available eiter as `messagebox` or `tkinter.messagebox`
回答by Targo_viste
try this
尝试这个
import sys
from tkinter import *
... and your code
...和你的代码
