Ethereum: Wallet JSON update not fetching data

As an experienced developer, it’s frustrating when a simple script doesn’t work as expected. In this article, we’ll solve the problem of saving Ethereum wallet data to a JSON file.

Problem

The code you provided above:

import json
from datetime import datetime
import requests
binance.client import client





Initialize Binance API credentials
client = Client("YOUR_BTC_API_Key", "YOUR_BTC_API_SECRET")
symbol = "ETH"
exchange = "binance"
def update_portfolio():
portfolio = {}

Get current portfolio data
response = client.get_exchange_data(exchange=exchange, symbol=symbol)
data = json.loads(response.text)

Parse JSON data to update wallet dictionary
in data["balances"]:
if asset["symbol"] == symbol:
asset_amount = float(asset["amount"])
coin_name = asset["asset"]["name"]
portfolio[coin_name] = asset_amount

Save the updated wallet data to a JSON file
open("portfolio.json", "w") as a file:
json.dump(portfolio, file)
update_portfolio()

After adding this code, a portfolio.json file is created in the same directory. However, nothing seems to happen when you try to update it with json.load() or json.dump().

Solution

The problem lies in the way we parse the JSON data from the Binance API. We need to use specific fields in each asset object that correspond to the currency we want to track. Here is an updated version of the code:

import json
from datetime import datetime
import requests
binance.client import client

Initialize Binance API credentials
client = Client("YOUR_BTC_API_Key", "YOUR_BTC_API_SECRET")
symbol = "ETH"
exchange = "binance"
def update_portfolio():
portfolio = {}

Get current portfolio data
response = client.get_exchange_data(exchange=exchange, symbol=symbol)
data = json.loads(response.text)

Parse JSON data to update wallet dictionary
in data["balances"]:
if asset["symbol"] == symbol:
asset_amount = float(asset["amount"])
coin_name = asset["asset"]["name"]
portfolio[coin_name] = asset_amount

Save the updated portfolio data to a JSON file
open("portfolio.json", "w") as a file:
json.dump(portfolio, file)
update_portfolio()

In this revised version:

• We use the json.load() variable directly instead of using the data variable.

• We loop through each asset object in the response and use its attributes (e.g. asset["symbol"], asset["amount"]) to determine which currency we want to track.

Use case example

To test this updated code, create a new file named “main.py” with the following content:

import json
from datetime import datetime
import requests
binance.client import client

Initialize Binance API credentials
client = Client("YOUR_BTC_API_Key", "YOUR_BTC_API_SECRET")
symbol = "BTC/USDT"
exchange = "binance"
def main():
portfolio = {}

Get current portfolio data
response = client.get_exchange_data(exchange=exchange, symbol=symbol)
data = json.loads(response.text)

Parse the JSON data to update the wallet dictionary
in data["balances"]:
if asset["symbol"] == symbol:
asset_amount = float(asset["amount"])
coin_name = asset["asset"]["name"]
portfolio[coin_name] = asset_amount

Save the updated wallet data to a JSON file
open("portfolio.json", "w") as a file:
json.dump(portfolio, file)
main()

Run the script using python main.py . This should create a new portfolio.json file in the same directory.

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