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#!/usr/bin/env python
#coding:utf8
# Author          : tuxpy
# Email           : q8886888@qq.com
# Last modified   : 2015-01-31 16:55:01
# Filename        : t1.py
# Description     : 

import pymongo

def get_all_key(obj):
    if isinstance(obj, dict):
        for key, value in obj.items():
            print key
            if isinstance(value, (list, dict)):
                get_all_key(value)

    if isinstance(obj, list):
        for item in obj:
            if isinstance(item, (dict, )):
                get_all_key(item)
           
db = pymongo.Connection().test
document = dict(db.test.find_one())
del document['_id']
get_all_key(document)