Most of the nosql databases have python clients which are actively supported. Pick your database based on your usage needs. Using it from python shouldn’t be a problem.
To name a few:
Cassandra: https://github.com/datastax/python-driver
Riak: https://github.com/basho/riak-python-client
MongoDB: http://api.mongodb.org/python/current/
CouchDB: http://wiki.apache.org/couchdb/Getting_started_with_Python
Redis: https://github.com/andymccurdy/redis-py