diff --git a/trestle/core/catalog/catalog_interface.py b/trestle/core/catalog/catalog_interface.py
index 2278ddbf4..da8c5929b 100644
--- a/trestle/core/catalog/catalog_interface.py
+++ b/trestle/core/catalog/catalog_interface.py
@@ -904,5 +904,5 @@ def generate_control_rule_info(self, part_id_map: Dict[str, Dict[str, str]], con
         if len(dup_comp_uuids) > 0:
             # throw an exception if there are repeated component uuids
             for comp_uuid in dup_comp_uuids:
-                logger.error(f'Component uuid { comp_uuid } is duplicated')
+                logger.error(f'Component uuid {comp_uuid} is duplicated')
             raise TrestleError('Component uuids cannot be duplicated between different component definitions')
diff --git a/trestle/transforms/implementations/tanium.py b/trestle/transforms/implementations/tanium.py
index 33d108137..e76f21ced 100644
--- a/trestle/transforms/implementations/tanium.py
+++ b/trestle/transforms/implementations/tanium.py
@@ -110,7 +110,7 @@ def transform(self, blob: str) -> Results:
         results.__root__ = tanium_oscal_factory.results
         ts1 = datetime.datetime.now()
         self._analysis = tanium_oscal_factory.analysis
-        self._analysis.append(f'transform time: {ts1-ts0}')
+        self._analysis.append(f'transform time: {ts1 - ts0}')
         return results
 
 
@@ -455,7 +455,7 @@ def _batch_observations(self, index: int) -> Dict[str, List[Observation]]:
         start = index * batch_size
         end = (index + 1) * batch_size
         end = min(end, len(self._rule_use_list))
-        logger.debug(f'start: {start} end: {end-1}')
+        logger.debug(f'start: {start} end: {end - 1}')
         # process just the one chunk
         for i in range(start, end):
             rule_use = self._rule_use_list[i]