在遍历嵌套的MongoDB（JSON）文档时遇到关键错误

Question

我正在遍历mongo文档

{
    "_id" : ObjectId("5b39cbd94a6"),
    "original_query" : "az",
    "posts" : [ 
           "comments" : [ 
            {
                "comment" : "",
                "commentator" : "Abd",
                "fb_id" : "1000"
            }, 
            {
                "comment" : "Sharjeel Usmani Alig Haider Ali Haider Saifullah Naseem Akhtar Alig Haider Ali Tanveer Khan Alig Imran Choudhary Nizampur Tarique Anwar Champarni",
                "commentator" : "Hi",
                "fb_id" : "1000"
            }],
           "like" : {
            "total" : "289",
            "reactors" : [ 
                {
                    "profile" : "",
                    "name" : "Ad ",
                    "fb_id" : "1000"
                }, 
                {
                    "profile" : "https://m.facebook.com",
                    "name" : "She ",
                    "fb_id" : "100"
                }
             ]
     ]
}

我想计算注释部分的单词数，但我什至无法遍历注释部分。以下是我的方法。

result=db.post.find().limit(3)
for post in doc['posts']:
    for com in post['comments'] :
        pprint.pprint(com['comment'])

但是我在第二个for循环中遇到关键错误。

编辑： 所需的输出：

 Sharjeel Usmani Alig Haider Ali Haider Saifullah Naseem Akhtar Alig Haider Ali Tanveer Khan Alig Imran Choudhary Nizampur Tarique Anwar Champarni"

编辑： 我已经使用

访问了喜欢字段的ID

for post in doc['posts']:
    if 'like' in post:
        for reactor in post['like']['reactors']:
            list_of_reactor_ids.append(reactor['id'])