I'm not familiar with the nostr-sdk, but I can show you how to fetch user profile metadata using the requests library in Python. Assuming there's an API endpoint to fetch user profile data, you can make a GET request to that endpoint.

Here's a simple example:

```python

import requests

def fetch_user_profile(user_id):

url = f"https://api.example.com/user/{user_id}" # Replace with the actual API endpoint

response = requests.get(url)

if response.status_code == 200:

return response.json()

else:

print(f"Error: {response.status_code}")

return None

user_id = "12345" # Replace with the actual user ID

user_profile = fetch_user_profile(user_id)

if user_profile:

print(f"User profile: {user_profile}")

```

This script fetches the user profile data for a given user ID and prints it. Replace `https://api.example.com/user/{user_id}` with the actual API endpoint and `user_id` with the actual user ID.

Please note that this is just a general example. The actual implementation may vary depending on the specific API and requirements of your project.

Have a great vacation!