Python How to split a packet to extract data

Question

I have a packet and I need to split it so that I can extract information from it. The packet is in string format and looks like this:

{"S.No":"9","data":[{"id":"ID1","value":" 0.34"},{"id":"ID2","value":" 2.92"},{"id":"ID3","value":" 2.92"}]}

From the above packet I need to extract the values of the id like for ID1 value 0.34

How can I extract all the values.

Thanks

try list comprehension: `[a['id'] for a in str['data']]` or `[a['value'] for a in str['data'] if a['id'] == 'ID1']` — ezdazuzena, Nov 23 '17 at 09:18
@timgeb Initially the data was in bytes like `(b'{"S.No":"9",...` then I used `data.decode("utf-8")` to convert it to string. — anna carolina, Nov 23 '17 at 09:22

score 4 · Accepted Answer · answered Nov 23 '17 at 09:21

4

If I understood correctly you can try something like:

import json
string_data = '{"S.No":"9","data":[{"id":"ID1","value":" 0.34"},{"id":"ID2","value":" 2.92"},{"id":"ID3","value":" 2.92"}]}'
data = json.loads(string_data)
[float(d['value']) for d in data['data']]
# will result in:
[0.34, 2.92, 2.92]

answered Nov 23 '17 at 09:21

pedromcaraujo

307
1
4

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Exactly my thought. Best way to deal with this imo. – Floran Gmehlin Nov 23 '17 at 09:22

Python How to split a packet to extract data

1 Answers1