Python, list of nested repeated keys

Question

I would like to process this json data in python:

{"data":
   [{"CU":"AGLD","CO": [{"chain":"ERC20"}],                 "fn":"Adventure Gold"}, 
    {"CU":"ACH","CO":  [{"chain":"ERC20"},    {"chain":"BEP20"}],   "fn":"Alchemy"}]}
    

I would like to get the value of all "chain"s. For example like this:

CU  chains:
AGLD    ERC20
ACH     ERC20
ACH     BEP20

I tried with a for loop, but (in the case of several "chain"s) it returns only the last value of "chain" for example ACH BEP20. Does not return ACH ERC20.

Answer 1

You said you used for-loop but you need neested for-loops - like this:

data = {"data": [
    {"CU":"AGLD", "CO": [{"chain": "ERC20"}],                    "fn":"Adventure Gold"}, 
    {"CU":"ACH",  "CO": [{"chain": "ERC20"}, {"chain":"BEP20"}], "fn":"Alchemy"}
]}

for item in data['data']:
    for subitem in item['CO']:
        print(item['CU'], subitem['chain'])

Result:

AGLD ERC20
ACH ERC20
ACH BEP20    

---

BTW:

You didn't show how you keep it but if you keep in dictionary then you need list to keep all values result[key] = [value1, value2]. If you will assing result[key] = value then you get only last item.