如何将python列表作为pymongo的map_reduce函数的作用域参数传递？

Question

我搜索了各种论坛，但没有找到确切答案。关于bson.code，Pymongo的文档非常少，没有示例。

实际上，我想将诸如list之类的Python变量传递给map_reduce函数的scope参数。

这是我的Python代码：

import pymongo
from pymongo import MongoClient
from bson.code import Code

client = MongoClient('mongodb://localhost/mydb')
db = client['mydb']

stopwords = ["The", "is", "at"]

mapper = Code("""
             function map() {
                // Some code here for mapper function....
             }
             """)

reducer = Code("""
             function reduce(key, values) {
               // Some code here for reducer function...
             }
             """)

最后调用mapreduce

output_collection = db.MediaSummary.map_reduce(
        mapper, reducer, 'SearchWords',
        scope = {
            "stop-words": stopwords    # This is line 91
        }
    )

执行时出现以下错误：

    Traceback (most recent call last):
  File "e:/Scripts/Python/VideoData_SearchWords_MapReduce.py", line 91, in <module>
    "stop-words": stop_words
  File "C:\Users\Faisal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymongo\collection.py", line 2773, in map_reduce
    user_fields=user_fields)
  File "C:\Users\Faisal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymongo\collection.py", line 252, in _command
    user_fields=user_fields)
  File "C:\Users\Faisal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymongo\pool.py", line 584, in command
    user_fields=user_fields)
  File "C:\Users\Faisal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymongo\network.py", line 158, in command
    parse_write_concern_error=parse_write_concern_error)
  File "C:\Users\Faisal\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymongo\helpers.py", line 155, in _check_command_response
    raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: exception: SyntaxError: Unexpected identifier

我不知道如何在这里使用bson.code。我猜可能是这个问题。但是无论如何都需要知道如何解决此代码？