Function in python written for a school exam

gistfile1.txt

def get_auth_token():
    global url
    global secret
    global clientId
    global tokenExpirationDate
    paramUrl = url + 'raspberry'
    paramData = {'clientId': clientId,
                 'clientSecret': secret}
    print("Requesting token...")
    r = requests.post(paramUrl, data=paramData, verify=False)
    global access_token
    global token_type
    print(r.text)
    response = json.loads(r.text)
    access_token = response['access_token']
    token_type = response['token_type']
tokenExpirationDate = datetime.now() + timedelta(seconds=response['expires_in'])