Spelling suggestions module in pure Python (for GAE)?

C开发者_StackOverflow中文版ould you recommend me a spelling suggestion library that can be used in Google App Engine (pure python).

Before moving to GAE we were using aspell-python.

UPDATE

What about some spelling API (e.g. google, yahoo, bing)?

I would have a look to whoosh for App Engine.
It offers a pure-python spell checker.