pickleDB is lightweight, fast, and simple database based on the json module. And it's BSD licensed!

>>> import pickledb

>>> db = pickledb.load('test.db', False)

>>> db.set('key', 'value')

>>> db.get('key')
'value'

>>> db.dump()
True

$ pip install pickledb

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• rem(key) now returns False instead of raising an exception (0.9dev)
• Change lrem(name) to lremlist(name) (0.9)
• Add lremvalue(name, value) (0.9)
• Add load() option to use sigterm handler or not (0.9)
• All keys must now be strings (0.8)
• All names for lists must now be strings (0.8)
• All names for dicts must now be strings (0.8)
• The get(key) function now returns False instead of None if there is no key (0.8)
• Switched to Python's built in json module from simplejson (0.8.1)