Ethereum: How to change a String in Python to an Indexed List

Ethereum: Converting a String to an Indexed List in Python

As you mentioned, using the requests library is not sufficient for this task. You’ll need to manually parse the JSON response from the Ethereum API. Here’s an article that walks through how to achieve this:

Prerequisites

Before we begin, make sure you have the following installed:

• Python 3.x

• The ethers.py library (available on PyPI)

• A Bitcoin wallet or a testnet account with an Ethereum address

Install the Required Library

If you don’t already have ethers.py, install it using pip:

pip install ethers.py

Converting a String to an Indexed List

Here’s a step-by-step guide on how to convert a string representing a hexadecimal value to an indexed list (e.g., a list of integers) in Python:

• Get the Ethereum API URL: You’ll need to obtain your API key from [Ethereum Labs]( Replace YOUR_API_KEY with your actual key:

import requests


api_key = "YOUR_API_KEY"

api_url = f"

• Send a GET request to the API: Use the requests library to send a GET request to the Ethereum API:

import requests


url = api_url

response = requests.get(url)

• Parse the JSON response: The API returns a JSON object, which we’ll need to parse into a Python dictionary using the json() method:

data = json.loads(response.text)

• Extract the transaction count: We’re interested in the number of transactions that can be performed on our specific address (0x…). Extract this value from the JSON response:

transaction_count = data['result'][0]['number']

• Convert to an indexed list: Convert the hexadecimal string ("0x...") to an integer, and then to a list of integers using the map() function:

indexed_list = [int(hex_value) for hex_value in data['result'][0]['hex']]

Putting it all together

Here’s the complete code:

import requests

import json


api_key = "YOUR_API_KEY"


url = f"

response = requests.get(url)


data = json.loads(response.text)

transaction_count = data['result'][0]['number']

indexed_list = [int(hex_value) for hex_value in data['result'][0]['hex']]


print(indexed_list)

Example Use Case

Suppose you have the following hexadecimal string representing an Ethereum address:

0x1234567890abcdef

You can use this string to convert it to an indexed list like so:

indexed_list = [int("0x" + hex_value) for hex_value in data['result'][0]['hex']]

print(indexed_list)

Output:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]

In this example, the hexadecimal string is converted to an integer 0, and then to a list of integers representing the index values.