Cumulatively add values to python dictionary without using Counter

问题

I have a following mongoDBschema- ObjectIDs are multiple entries in the database ,in which the further data is stored.

ObjectId("a")
    posts
        [0]
            comments
                [0]
                    comment
                    fb_id
        [1]
        [2]
        [3]
        [4]

ObjectId("b")
ObjectId("c")

I am trying to cumulatively add the sentiment value,I am assigning to the dictionary for each comment corresponding to every fb_id.I tried using counter method but it's values are emptying before entering another id's comment automatically. Earlier,I asked this question-Cumulatively add values to python dictionary and the output ,I received is below-

 Counter({'100002204201460': 0.0})
 Counter({'100002204201460': 0.0, '100025548426588': -0.592})
 Counter({'1490834948': 0.5792,
     '100002204201460': 0.0,
     '100025548426588': -0.592})

Counter is emptying itself before entering into another comment of same post.

My implementation-

 for doc in result:
     dict_of_comments = Counter()
     for post in doc['posts']: # traverse each user's post
        if 'comments' in post:
        for com in post['comments']:
            s=com['comment']
            vs=analyzer.polarity_scores(s) //sentiment analyser
            dict_of_comments[com['fb_id']] += vs['compound']
            pprint.pprint(dict_of_comments)

How to do it correctly,I just want to cumulatively add values without losing any of the values as currently ,I am loosing using Counter.

Input in one of the objectID

 {
  "_id" : ObjectId("5b7fa2a745d12b10324d3a01"),
  "date_time" : "24, Aug 2018 11:44",
  "original_query" : "sanjeevnewar",
  "posts" : [ 
           "comments" : [ 
            {
                "comment" : "आशीष जी को कोटि कोटि प्रणाम।",
                "commentator" : "Amrit Kumar Deb",
                "fb_id" : "100002204201460"
            }, 
            {
                "comment" : "Double standard is not going to work  Stop ogling over Muslim women",
                "commentator" : "Akif Khan",
                "fb_id" : "100025548426588"
            }
          ]
         ]
       }

Output ,if a standard dictionary is used without using Counter is as below

 {'100002204201460': 0.0}
 {'100002204201460': 0.0, '100025548426588': -0.296}

This is just a sample output, not all values are included. But the issue is if my program encounters a same fb_id value(which is 100002204201460) in later posts, then it will just rewrite the dictionary with new values rather than adding values to it. How to do it?

来源：https://stackoverflow.com/questions/52184270/cumulatively-add-values-to-python-dictionary-without-using-counter

标签

python

python-3.x

mongodb

counter