import requests
import json
from requests.auth import HTTPBasicAuth

url = 'https://api.pinnacle.com/'


def request(api_method):
    username = 'х'
    password = 'х'
    URL = url + api_method
    headers = {
    'Authorization': HTTPBasicAuth(username, password),
    'Content-Type': 'application/json',
    'Accept': 'application/json'
    }

    r = requests.get(URL, headers)
    return r.json()

print(request('v2/sports'))

{'code': 'INVALID_AUTHORIZATION_HEADER', 'message': 'HTTP Authorization header is missing'}