这个列表由最新版本(也是默认选择的)和所有的注册遗留版本组成。
The list consists of the latest version (and it is selected by default) and all registered legacy versions.
假定您选择的运行环境包含最新版本的Perl，您将需要安装Geocoding模块和GD Perl模块，以及CAIDA的plot - latlong。
Assuming your operating environment of choice contains a recent version of Perl, you'll need to install the Geocoding and GD Perl modules, as well as CAIDA's plot-latlong.
当然，这时您会倾向于选择jyphon本身的最新版本，本文中用的是2.1，比较老(相对于CPython最近发布的2.3版本)。
Of course, you are stuck at the latest version of Jython itself for this approach, which as of this writing lagged at 2.1 (compared to CPython's recent 2.3 release).
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