interpolating variable to a complex string in python

Question

I have a variable group_array like this

groups_array=[{"group": "18652_PDR"}, {"group": "11262_PDR"}, {"group": "3787_PDR"}, {"group": "4204_PDR"}]

I want to put the groups_array variable inside below string so I tried like this using the f method

data = f'{"request":{"streaming_type":"quote", "data":{"groups": {groups_array}}, "request_type":"subscribe", "response_format":"json"}}'

But am getting error deeply nested error

I want the string to be in below format after adding the variable

data = '{"request":{"streaming_type":"quote", "data":{"groups": [{"group": "18652_PDR"}, {"group": "11262_PDR"}, {"group": "3787_PDR"}, {"group": "4204_PDR"}]}, "request_type":"subscribe", "response_format":"json"}}'

Could someone tell me how can I properly do it in this case as there are too many "" and {}?

@PatrickArtner trying to send the data to an api using websocket. This is the format it is expecting — Abhilash
– Abhilash, Commented May 26, 2021 at 13:32

schilli · Accepted Answer · 2021-05-26 13:39:34Z

2

You can just use the built-in json package. You would create a dictionary of your data and pass it to json.dumps to receive the json string.

import json
groups_array = [{"group": "18652_PDR"}, {"group": "11262_PDR"}, {"group": "3787_PDR"}, {"group": "4204_PDR"}]
data = {"request":
            {"streaming_type": "quote",
             "data": {
                     "groups": groups_array
             },
             "request_type": "subscribe",
             "response_format": "json"
             }
        }

data_json = json.dumps(data)
print(data)

# Output:
{'request': {'streaming_type': 'quote', 'data': {'groups': [{'group': '18652_PDR'}, {'group': '11262_PDR'}, {'group': '3787_PDR'}, {'group': '4204_PDR'}]}, 'request_type': 'subscribe', 'response_format': 'json'}}

answered May 26, 2021 at 13:39

schilli

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Comments

Egor Wexler · Accepted Answer · 2021-05-26 13:37:51Z

1

You can assign directly to dict and create a json (stringify it) if your request needs string:

import json

data = json.dumps({"request":{"streaming_type":"quote", "data":{"groups": groups_array}, "request_type":"subscribe", "response_format":"json"}})

Or if dictionary is also an option - pass it without json.dumps

answered May 26, 2021 at 13:37

Egor Wexler

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