You are downloading the Python 3 XAP file v220.127.116.11 for Windows Phone. Python 3 is a free and useful Education app: Python 3 For Windows Phone is a Windows Phone 8 app that provides an interactive Python shell. You can run scripts either interactively, by typing ... You can now download the offline XAP file to install & try it.
Download Locations for Python 3 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Python 3 XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.