solr Client

Haystack provides modular search for Django. It features a unified, familiar API that allows you to plug in different search backends (such as Solr, Whoosh, Xapian, etc.) without having to modify your code.

http://docs.haystacksearch.org/dev/toc.html

solrpy is a python client for solr, an enterprise search server built on top of lucene. solrpy allows you to add documents to a solr instance, and then to perform queries and gather search results from solr using your favorite programming language--python.
url: http://code.google.com/p/solrpy/

Django Solr search is a Django pluggable for rapidly integrating Solr search into a Django Application. It was originally written for The Washington Times. Readers where complaining that they were never able to find relevant content and they weren't given the tools to narrow down their search. With some of our past experiences with Solr it seemed like the obvious choice for this type of enterprise search concept.

http://code.google.com/p/django-solr-search/