just a flag in the ground I've taken the python library from recurly.com (for their credit-card payment system) and it works just fine locally, on dev_appserver and on GAE.
recurly.py (<300 lines) makes use of import base64, import types, import re, import urllib, import urllib2. nice to have something slip in so smoothly. separately... had my head down when the 3rd edition of the Web2py book came out... have just ordered it.