安装完Python２.５１运行测试均正常，然后安装GUI的wxPython2.8运行范例老是提示错误：
Error:Inconsistent indentation detected!
1)Your indentation outright incorrect(easy to fix),OR
2)Your indentation mixes tabs and spaces.
To fix case 2,change all tabs to spaces by using Edit->Select All followed by Format_>Untabify Region and specify the number of columns used by each tab.

在Python的Edit菜单里找不到Select All followed by Format.

如何解决？

谢谢！