Fixed pylint issues (#32)

Author: kara-kiss

eric-oss-hello-world-python-app/login.py

@@ -51,10 +51,10 @@ def tls_login(url, headers):
     cert = (app_cert, app_key)
 
     try:
-        with open(client_id_path, "r") as f:
+        with open(client_id_path, "r", encoding="utf-8") as f:
             form_data["client_id"] = f.read().strip()
     except OSError as e:
-        raise LoginError(f"Error while reading client id: {e}")
+        raise LoginError(f"Error while reading client id: {e}") from e
 
     try:
         response = requests.post(

eric-oss-hello-world-python-app/tests/test_login.py

@@ -4,7 +4,9 @@
 from login import login, LoginError
 import pytest
 
+
 def test_login_receives_token_x509(mock_login_api, config):
+    # pylint: disable=unused-argument
     """Check if we receive a token"""
     token, expiry = login()
     assert token == "2YotnFZFEjr1zCsicMWpAA" and expiry > time.time()

eric-oss-hello-world-python-app/tests/test_mtls_logging.py

@@ -1,6 +1,5 @@
 """Tests which cover the app's logging, both to STDOUT and to Log Aggregator"""
 
-import builtins
 import json
 from unittest import mock
 import requests