mypy compliant

code/database.py

@@ -25,7 +25,7 @@ def connect(
     # load environment variables
     load_dotenv()
     ip_addr = os.getenv(
-        'DB_IP_ADDRESS', 
+        'DB_IP_ADDRESS',
         default=DB_IP_ADDRESS
     )
     db_name = os.getenv(

code/initialise_app.py

@@ -27,7 +27,11 @@ def initialise_app(
     """
     # load environment variables
     load_dotenv()
-    assert 'USER_ID' in os.environ, 'environment variable USER_ID must be specified'
+    assert (
+        'USER_ID' in os.environ
+    ), (
+        'environment variable USER_ID must be specified'
+    )
     logger_level = os.getenv(
         'LOGGER_LEVEL',
         default=LOGGER_LEVEL
@@ -63,5 +67,5 @@ def initialise_app(
 
 
 if __name__ == '__main__':
-    user_id = initialise_app()
+    initialise_app()
     logging.warning('test message')

code/main.py

@@ -123,7 +123,7 @@ if __name__ == '__main__':
             )
         # extra data flush
         if (
-            time.time() >= data_flush_time and 
+            time.time() >= data_flush_time and
             data_queue.qsize() > 0
         ):
             logging.debug('triggered extra data flush')