How to append list entries to a JSON file through a for loop?

Question

In the following code, I am trying to append every oth element to a JSON file:

title = []  # api_result['search_results']['title']
asin = []  # api_result['search_results']['asin']
link = []  # api_result['search_results']['link']
categories = []  # api_result['search_results']['categories'][0]['name']
image_url = []  # api_result['search_results']['image']
rating = []
rating_total = []
price = []  # apit_result['prices'][0]['value']
top_positive_review = []
top_positive_review_rating = []
top_critical_review = []
top_critical_review_rating = []
ratings_total_filtered = []  # apit_result['']
reviews_total_filtered = []
reviews_total = []
reviews = []

for o in range(len(title)):
    with open("metadata.jsonl", "w+") as outfile:
        entry = {
                'title': title[o],
                'asin': asin[o],
                'link': link[o],
                'categories': categories[o],
                'image_url': image_url[o],
                'rating': rating[o],
                'rating_total': rating_total[o],
                'price': price[o],
                'top_positive_review': top_positive_review[o],
                'top_positive_review_rating': top_positive_review_rating[o],
                'top_critical_review': top_critical_review[o],
                'top_critical_review_rating': top_critical_review_rating[o],
                'ratings_total_filtered': ratings_total_filtered[o],
                'reviews_total_filtered': reviews_total_filtered[o],
                'reviews_total': reviews_total[o],
                'reviews': reviews[o]}

I take that this isn’t the proper way of doing this. Basically, I want entries like this in the metadata.jsonl file:

{"title":"some title", "asin":"ABCDEF", ...}
{"title":"another title", "asin":"GHIJKL", ...}
...

Where am I going wrong?

Asked By: oo92

||

Source

Answer 1

Opening the file must be done only once with the with open block, otherwise it opens and closes the file at each iteration.

Thereafter, just wrap at each iteration.

Look at this code:

import json

# I am assuming your data in this form
title = ['title_0', 'title_1']
link = ['link_0', 'link_1']

with open("metadata.jsonl", "w") as file:
    for o in range(len(title)):
        entry = {
            'title': title[o],
            'link': link[o],
        }
        json_object = json.dumps(entry, ensure_ascii=False)  # on line json
        file.write(json_object)
        file.write("n")

output will be:

{"title": "title_0", "link": "link_0"}
{"title": "title_1", "link": "link_1"}

Answered By: Giuseppe La Gualano

How to append list entries to a JSON file through a for loop?

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