diff --git a/aws-lambda/lambda_function.py b/aws-lambda/lambda_function.py
index 7df64fa..dab3e0c 100644
--- a/aws-lambda/lambda_function.py
+++ b/aws-lambda/lambda_function.py
@@ -8,17 +8,18 @@
 print('Loading function')
 s3 = boto3.client('s3')
 
+
 def handler(event, context):
 
-    # Get the object from the event 
+    # Get the object from the event
     bucket = event['Records'][0]['s3']['bucket']['name']
-    key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8')
+    key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8') # noqa
     size = event['Records'][0]['s3']['object']['size']
     print("object="+key+" received with size="+str(size))
     if size == 0:
         print("object="+key+" size=0, don't process !")
         return 0
-   
+
     filename = key.split('/')[-1]
     foldername = key.replace(filename, '')
 
@@ -31,17 +32,26 @@ def handler(event, context):
 
     # TODO: read the metadata file from S3
     metadata_file = open('/function/station_list.csv', 'r')
-    
+
     nbufr_created = 0
-    bufr_generator = transform_synop(body, metadata_file.read(), year_utc, month_utc)
+    bufr_generator = transform_synop(
+        body,
+        metadata_file.read(),
+        year_utc,
+        month_utc
+    )
     for item in bufr_generator:
         if 'bufr4' in item and item['bufr4'] is not None:
             identifier = item['_meta']['id']
             print('identifier='+identifier)
-            s3.put_object(Bucket='wis2box-public', Key=foldername+identifier+'.bufr4', Body=item['bufr4'])
+            s3.put_object(
+                Bucket='wis2box-public',
+                Key=foldername+identifier+'.bufr4',
+                Body=item['bufr4']
+            )
             nbufr_created += 1
         else:
             print('No BUFR message created for '+item['_meta']['id'])
     print('Created '+str(nbufr_created)+' BUFR messages')
 
-    return 0
\ No newline at end of file
+    return 0