CODEWITHSUNDEEP
pythonjsondictionarywikipedia-api
GameDesert
GameDesert

Reputation: 145

Python & JSON | Can't access dictionary using an index

I have a program that looks like this:

import json
import requests
article_name = "BT Centre"
article_api_url = "https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro=&explaintext=&titles={}".format(article_name)
called_data = requests.get(article_api_url)
formatted_data = called_data.json()
print(formatted_data)
pages = formatted_data["query"]["pages"]
print(pages)
first_page = pages[0]["extract"]
print(first_page)

For the first print statement, where it prints the whole JSON, it returns this:

{
  'batchcomplete': '',
  'query':{
    'pages':{
      '18107207':{
        'pageid': 18107207,
        'ns': 0,
        'title':'BT Centre',
        'extract': "The BT Centre is the global headquarters and registered office of BT Group..."
      }
    }
  }
}

When I try to access the "extract" data with the first_page variable, it returns:

Traceback (most recent call last):
  File "wiki_json_printer.py", line 15, in <module>
    first_page = pages[0]["extract"]
KeyError: 0

The problem is, I can't set first_page to pages["18107207"]["extract"] because the Page ID changes for every article.

Edit: Solution from Ann Zen works:

You can use a for loop to loop through the keys of the pages dictionary, and detect which one is the ID via the str.isdigit() method:

for key in pages:
    if key.isdigit():
        print(pages[key]["extract"])

Upvotes: 1

Views: 510

Answers (3)

uingtea
uingtea

Reputation: 6554

pages is dictionary not a list you can't select it by index, use it key

print(pages['18107207']['extract'])

of course the following will work because the key is 18107207

for key in pages:
    print(pages[key]["extract"])

Upvotes: 1

Serge Ballesta
Serge Ballesta

Reputation: 149155

You could use next on an iterator on the dict to find the first key:

...
key = next(iter(pages))
first_page = pages[key]["extract"]
...

Upvotes: 1

Red
Red

Reputation: 27577

You can use a for loop to loop through the keys of the pages dictionary, and detect which one is the ID via the str.isdigit() method:

for key in pages:
    if key.isdigit():
        print(pages[key]["extract"])

Upvotes: 1

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