Find a value in a list of dictionaries

Question

I have the following list:

 {

   "id":1,
   "name":"John",
   "status":2,
   "custom_attributes":[
      {
         "attribute_code":"address",
         "value":"st"
      },
      {
         "attribute_code":"city",
         "value":"st"
      },
      {
         "attribute_code":"job",
         "value":"test"
      }]
}

I need to get the value from the attribute_code that is equal city

I've tried this code:

if list["custom_attributes"]["attribute_code"] == "city" in list:
     var = list["value"]

But this gives me the following error:

TypeError: list indices must be integers or slices, not str

What i'm doing wrong here? I've read this solution and this solution but din't understood how to access each value.

I'll though this was a list of dictionaries because have dictionaries within it. But ok, I'll try to find a reference to understand the difference between them. — OdiumPura, Sep 23 '21 at 17:02
You have a dictionary - let's call it **D**. You can access keys in a dictionary directly. You cannot access values in a dictionary directly. D['custom_attributes'] is a list of dictionaries. Each element in that list is a dictionary. You can use the dictionary built-in function *items()* to work through each of those dictionaries to try to find what you're looking for — , Sep 23 '21 at 17:03

score 3 · Accepted Answer · answered Sep 23 '21 at 17:01

Another solution, using next():

dct = {
    "id": 1,
    "name": "John",
    "status": 2,
    "custom_attributes": [
        {"attribute_code": "address", "value": "st"},
        {"attribute_code": "city", "value": "st"},
        {"attribute_code": "job", "value": "test"},
    ],
}

val = next(d["value"] for d in dct["custom_attributes"] if d["attribute_code"] == "city")
print(val)

Prints:

st

score 2 · Answer 2 · answered Sep 23 '21 at 16:59

Your data is a dict not a list.
You need to scan the attributes according the criteria you mentioned.
See below:

data = {

    "id": 1,
    "name": "John",
    "status": 2,
    "custom_attributes": [
        {
            "attribute_code": "address",
            "value": "st"
        },
        {
            "attribute_code": "city",
            "value": "st"
        },
        {
            "attribute_code": "job",
            "value": "test"
        }]
}

for attr in data['custom_attributes']:
    if attr['attribute_code'] == 'city':
        print(attr['value'])
        break

output

st

Find a value in a list of dictionaries

2 Answers2