mongodb建索引

db.zk.ensureIndex({"u":1},{"unique":true})

删除重复

from pymongo import MongoClientclient = MongoClient()db = client.vipdocumentname = db.zkkeys = {}for k in documentname.find():    key = k['u']    if keys.has_key(key):        print 'duplicate key %s' % key        documentname.remove({'_id':k['_id']})    else:        keys[key]=1