example_request.py

import requests
from requests.exceptions import HTTPError

isa = 'https://api.github.com/users/iris9112/gists'
santi = 'https://api.github.com/users/rmotr-doesnt-exist/gists'

for url in [isa, santi]:
    try:
        response = requests.get(url)
        # If the response was successful, no Exception will be raised
        response.raise_for_status()
        data = response.json()
    except HTTPError as http_err:
        print(f'HTTP error occurred: {http_err}')  # Python 3.6
    except Exception as err:
        print(f'Other error occurred: {err}')  # Python 3.6
    else:
        print('Success!')
        print(data[0]['url'])
        print('--------')