Extract information from JSON output

Question

I am trying to extract information from a JSON. I have been able to extract some parts without problem, but I have problems extracting strings at very low levels.

I got an output of what I need in this format. This I have stored in a list. Here is the example:

prices = [{'info': {'price': '2.00', 'desc': 'Up'}},
 {'info': {'price': '1.50', 'desc': 'Down'}},
 {'info': {'price': '3.00', 'desc': 'Down'}},
 {'info': {'price': '3.00', 'desc': 'Up'}},
 {'info': {'price': '8.40', 'desc': 'Down'}},
 {'info': {'price': '14.20', 'desc': 'Down'}}]

From this list I would like to extract the elements price and desc from each of them, stored in a list each.

I have tried to pass this list to a str string and use operators to search directly in the content, but I don’t know how to do it in a simpler way.

Do you know a simpler way to do it?

Asked By: Folleloide

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Source

Answer 1

price = [i['info']['price'] for i in prices]
desc  = [i['info']['desc'] for i in prices]

Answered By: Deera Wijesundara

Answer 2

JSON is a serialization format. Once you’ve decoded it, its just python. In your example, price is a list of dict with a sub-dict. One option is to iterate the list, then get the dictionary information based off of known key names.

prices = [{'info': {'price': '2.00', 'desc': 'Up'}},
 {'info': {'price': '1.50', 'desc': 'Down'}},
 {'info': {'price': '3.00', 'desc': 'Down'}},
 {'info': {'price': '3.00', 'desc': 'Up'}},
 {'info': {'price': '8.40', 'desc': 'Down'}},
 {'info': {'price': '14.20', 'desc': 'Down'}}]

for data in prices:
    price = data['info']['price']
    desc = data['info']['desc']
    print(price, desc)

output

2.00 Up
1.50 Down
3.00 Down
3.00 Up
8.40 Down
14.20 Down

Answered By: tdelaney

Extract information from JSON output

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