如何在Mac OS X上安装wxPython ?

I'd like to use wxPython on my Mac OS 10.7 (Lion) computer. (I'm a Tkinter refugee.) I upgraded from Python 2.7.1, then downloaded and installed wxPython2.8-osx-unicode-2.8.12.1-universal-py2.7.dmg. Here's what I get:I'd like to use wxPython on my Mac OS 10.7 (Lio