non-pretty-simplejson.py

import datetime
import pymongo
import simplejson
from pymongo.objectid import ObjectId


class DateTimeMongoEncoder(simplejson.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, (datetime.date, datetime.datetime)):
            return obj.strftime('%Y-%m-%dT%H:%M:%S')
        elif isinstance(obj, ObjectId):
            return """ObjectId("%s")""" % str(obj)
        else:
            return simplejson.JSONEncoder.default(self, obj)


simplejson.dumps(item, cls=DateTimeMongoEncoder)