Try
import json
Data1 = """{
"accounts": [{
"userLoginKey": "082223",
"accountId": "j5j556f"
},
{
"userLoginKey": "097644",
"accountId": "qx954fjg"
},
{
"userLoginKey": "089675",
"accountId": "h54ub5"
},
{
"userLoginKey": "084575",
"accountId": "jfh9nh5"
},
{
"userLoginKey": "088838",
"accountId": "i6kn6j"
}
]
}"""
Data2 = """ {
"finance_assets": [{
"contractorAccountId": "j5j556f",
"balance": 3999
},
{
"contractorAccountId": "qx954fjg",
"balance": 3084775
},
{
"contractorAccountId": "khojoh7",
"balance": -1000000
},
{
"contractorAccountId": "h54ub5",
"balance": 113578277
},
{
"contractorAccountId": "jngi408",
"balance": -31116496
},
{
"contractorAccountId": "jfh9nh5",
"balance": 5
},
{
"contractorAccountId": "njvgj54g",
"balance": 22
},
{
"contractorAccountId": "i6kn6j",
"balance": 3000
},
{
"contractorAccountId": "qx954fjg",
"balance": 1200
}
]
}"""
acc = json.loads(Data1)
ass = json.loads(Data2)
aid = [ x.get('accountId') for x in acc.get('accounts') ]
bal = [ x.get('balance') for x in ass.get('finance_assets') if x.get('contractorAccountId') in aid]
total_assets = sum(bal)
print(total_assets)