>>> db.test.insert_many([{"x": i} for i in range(10)])
<pymongo.results.InsertManyResult object at 0x109151e80>
>>> len(list(db.test.find().where('this.x < 3')))
3
>>> len(list(db.test.find().where(Code('this.x < i', {'i':3}))))
3

>>> db.test.insert_many([{"x": i} for i in range(10)])
<pymongo.results.InsertManyResult object at 0x109151e80>
>>> len(list(db.test.find().where('this.x < 3')))
3
>>> len(list(db.test.find().where(Code('this.x < i', {'i':3}))))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shane/git/mongo-python-driver/pymongo/cursor.py", line 1156, in next
    if len(self.__data) or self._refresh():
  File "/Users/shane/git/mongo-python-driver/pymongo/cursor.py", line 1073, in _refresh
    self.__send_message(q)
  File "/Users/shane/git/mongo-python-driver/pymongo/cursor.py", line 953, in __send_message
    response = client._run_operation_with_response(
  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 1342, in _run_operation_with_response
    return self._retryable_read(
  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 1464, in _retryable_read
    return func(session, server, sock_info, slave_ok)
  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 1334, in _cmd
    return server.run_operation_with_response(
  File "/Users/shane/git/mongo-python-driver/pymongo/server.py", line 136, in run_operation_with_response
    _check_command_response(first)
  File "/Users/shane/git/mongo-python-driver/pymongo/helpers.py", line 161, in _check_command_response
    raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: ReferenceError: i is not defined :
@:1:15