JSON字符串索引必须是整数

Question

There are a number of questions with this subject, but most seem to be people forgetting to call json.loads .

Here is my example:

import json

json_input = '{ "ar": { "articles": { "12345": {"title": "first title" } , "67890": {"title": "another title" } } } } '

data = json.loads(json_input)

for article in data['ar']['articles']:
    print(article['title'])

The call to print fails with the error:

TypeError: string indices must be integers

How can I resolve this?

Answer 1

What you are currently printing is the key for the article dict, and not the article's title itself. If you print article in your example, it will print the keys

In [6]: for article in data['ar']['articles']:
        print(article)
   ...:     
67890
12345

To print the article's title, iterate on the items within the dict:

In [1]: import json

In [2]: json_input = '{ "ar": { "articles": { "12345": {"title": "first title" } , "67890": {"title": "another title" } } } } '

In [3]: data = json.loads(json_input)

In [4]: for article in data['ar']['articles'].values():
   ...:     print(article['title'])
   ...:     
another title
first title