1. 遇到的问题

在学习Python的标准库tkinter的时候，教程用的是Python2.7 , 而我使用的是的Python3.4。按照教程加载tkMessageBox库，发现居然没有这个库。猜想应该是把tkMessageBox的名字给换成别的了。

2. 问题的解决

上Python官网去查看想是否有相关信息。找到了以下信息，就猜测的那样是把命名给换了。tkMessageBox名字换成了tkinter.messagebox。

Python 3.4 tk支持库描述

tkinter.scrolledtext
    Text widget with a vertical scroll bar built in.
tkinter.colorchooser
    Dialog to let the user choose a color.
tkinter.commondialog
    Base class for the dialogs defined in the other modules listed here.
tkinter.filedialog
    Common dialogs to allow the user to specify a file to open or save.
tkinter.font
    Utilities to help work with fonts.
tkinter.messagebox
    Access to standard Tk dialog boxes.
tkinter.simpledialog
    Basic dialogs and convenience functions.
tkinter.dnd
    Drag-and-drop support for tkinter. 
turtle
    Turtle graphics in a Tk window.

python2.7 tk支持库描述的描述

ScrolledText
    Text widget with a vertical scroll bar built in.
tkColorChooser
    Dialog to let the user choose a color.
tkCommonDialog
    Base class for the dialogs defined in the other modules listed here.
tkFileDialog
    Common dialogs to allow the user to specify a file to open or save.
tkFont
    Utilities to help work with fonts.
tkMessageBox
    Access to standard Tk dialog boxes.
tkSimpleDialog
    Basic dialogs and convenience functions.
Tkdnd
    Drag-and-drop support for Tkinter. 
turtle
    Turtle graphics in a Tk window.

3. 名字更换对比

Tkinter                    -->tkinter
ScrolledText               -->tkinter.scrolledtext
tkColorChooser             -->tkinter.colorchooser
tkCommonDialog             -->tkinter.commondialog
tkSimpleDialog             -->tkinter.simpledialog
tkFont                     -->tkinter.font
tkMessageBox               -->tkinter.messagebox
tkSimpleDialog             -->tkinter.simpledialog
Tkdnd                      -->tkinter.dnd
turtle                     -->turtle        

4.为什么要更换命名

在Python3.x版本中原先的那些Tk支持库，作为tkinter的子模块了，名字自然也就变了。

参考

https://docs.python.org/3.4/library/tkinter.html#tkinter-modules
https://docs.python.org/2.7/library/tkinter.html#tkinter-modules