chore: use kwargs in method calls, add comment to SQSBatchProcessingError

Author: Tom McCarthy

aws_lambda_powertools/utilities/batch/exceptions.py

@@ -12,6 +12,8 @@ def __init__(self, msg="", child_exceptions=()):
         self.msg = msg
         self.child_exceptions = child_exceptions
 
+    # Overriding this method so we can output all child exception tracebacks when we raise this exception to prevent
+    # errors being lost. See https://github.com/awslabs/aws-lambda-powertools-python/issues/275
     def __str__(self):
         parent_exception_str = super(SQSBatchProcessingError, self).__str__()
         exception_list = [f"{parent_exception_str}\n"]

aws_lambda_powertools/utilities/batch/sqs.py

@@ -91,10 +91,10 @@ def _process_record(self, record) -> Tuple:
             An object to be processed.
         """
         try:
-            result = self.handler(record)
-            return self.success_handler(record, result)
+            result = self.handler(record=record)
+            return self.success_handler(record=record, result=result)
         except Exception:
-            return self.failure_handler(record, sys.exc_info())
+            return self.failure_handler(record=record, exception=sys.exc_info())
 
     def _prepare(self):
         """