import pymongo

client = pymongo.MongoClient()
client.drop_database('test_db')
client['admin'].command({'setParameter': 1, 'notablescan': False})

db = client.test_db
coll = db['coll']

res = coll.insert({'a': {'png': 0, 'jpg': 0}})
entries = list(coll.find())
print "All entries:", entries
for e in entries:
    res = list(coll.find(e))
    print "Single entry", res
    assert len(res) == 1 and res[0] == e

client.drop_database('test_db')