[Python] Iterating over dictionary of lists of dictionaries in python [closed]

Please help in providing a solution to iterate through a dictionary containing lists of dictionaries in python. To be precise below is the structure you can consider for the dictionary:

{
"cart": [
{
"id": "0Zy2jwLzQzlk7xq3",
"benefit_id": "-1",
"plan_id": "-1",
"change": 5,
"change_at": "2025-03-13 15:03:00+05:30",
"nominees": [],
"dependents_ids": [],
"upload_nominees_form": null,
"mid_term": false,
"endorsement_id": "OJ1xzPR8N2V0gMbd",
"premium_value": 0.0,
"sum_insured": 0,
"annual_premium": 0.0,
"employer_premium": 0.0,
"added_by": 0
},
{
"id": "J1xzPR8JmLV0gMbd",
"benefit_id": "-1",
"plan_id": "-1",
"change": 4,
"change_at": "2025-03-13 15:03:05+05:30",
"nominees": [],
"dependents_ids": [],
"upload_nominees_form": null,
"mid_term": false,
"endorsement_id": "OJ1xzPR8N2V0gMbd",
"premium_value": 0.0,
"sum_insured": 0,
"annual_premium": 0.0,
"employer_premium": 0.0,
"added_by": 0
}],
"complete_cart": [{"modified":"false"}]
}


I am using a for loop to iterate through the values, but is getting below error:

TypeError: string indices must be integers, not 'str'


I want to read the values of subkeys inside each list dictionary to apply further logics

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