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 enough for this task. You will need to manually parse the JSON response from the Ethereum API. Here is an article that shows how to achieve this:
Prerequisites
Before you 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 the “ethers.py” file, install it using pip:
pip install ethers.py
Converting a string to an indexed list
Here is a step-by-step guide on how to convert a string representing a hexadecimal value to an indexed list (such as a list of integers) in Python:
- Get the Ethereum API URL: You will need to obtain an API key from [Ethereum Labs] ( Replace the key “YOUR_API_KEY” with your actual key:
import requests
api_key = "YOUR_API_KEY"
api_url = f" 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 long ran 0000000000000000000000000000000000000000000000000000000000000000000000000001&apikey={api_key}"
- 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)
- Parsing the JSON response: The API returns a JSON object, which we need to parse into a Python dictionary using the "json()" method:
data = json.loads(response.text)
- Extracting the number of transactions: We are interested in the number of transactions that can be executed on our given address (0x...). Extract this value from the JSON response:
transaction_count = data['result'][0]['count']
- Convert to indexed list: Convert the hexadecimal string ("0x...") to an integer, 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 full code:
import requests
import json
api_key = "YOUR_API_KEY"
url = f" 0 to a list, for example:
python
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 of 0, and then to a list of integers representing the index values.
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