diff --git a/src/caosdb/apiutils.py b/src/caosdb/apiutils.py
index 70f7db9c86c76098c6f4783e128cd54d065e6d95..81358cd350be4309f8311c99563953fcdbf2401e 100644
--- a/src/caosdb/apiutils.py
+++ b/src/caosdb/apiutils.py
@@ -239,7 +239,7 @@ def compare_entities(old_entity: Entity, new_entity: Entity,
         if isinstance(entity, Property):
             raise NotImplementedError("The function compare_entities does not work for "
                                       "comparing abstract properties.")
-    
+
     olddiff: Dict[str, Any] = {"properties": {}, "parents": []}
     newdiff: Dict[str, Any] = {"properties": {}, "parents": []}
 
@@ -347,7 +347,6 @@ def compare_entities(old_entity: Entity, new_entity: Entity,
                 newdiff["properties"].pop(prop.name)
                 olddiff["properties"].pop(prop.name)
 
-            
     # Check whether there are missing properties in old_entity, additionally
     # check for multi-properties that are currently not supported:
     for prop in new_entity.properties:
@@ -355,7 +354,7 @@ def compare_entities(old_entity: Entity, new_entity: Entity,
         if len(matching) > 1:
             raise NotImplementedError(
                 "Comparison not implemented for multi-properties.")
-        
+
         if len([0 for p in old_entity.properties if p.name == prop.name]) == 0:
             newdiff["properties"][prop.name] = {}
 
diff --git a/unittests/test_apiutils.py b/unittests/test_apiutils.py
index df06f4db38aca6a29bc23fdfd7ca26feb7e850ed..c6cee61b63b9b5b7ae1dbe2d00959490b16eff75 100644
--- a/unittests/test_apiutils.py
+++ b/unittests/test_apiutils.py
@@ -109,7 +109,8 @@ def test_compare_entities():
     r1.add_property("tester", value=3)
     r2.add_property("tester", )  # a property where r2 has no value
     r1.add_property("tests_234234", value=45)
-    r2.add_property("tests_TT", value=45)  # one additional property that the other one does not have for both
+    # one additional property that the other one does not have for both
+    r2.add_property("tests_TT", value=45)
 
     diff_r1, diff_r2 = compare_entities(r1, r2)
 
@@ -134,6 +135,7 @@ def test_compare_entities():
     assert diff_r1["properties"]["tests"]["value"] == 3
     assert diff_r2["properties"]["tests"]["value"] == 45
 
+
 def test_compare_equality():
     r1 = db.Record()
     r2 = db.Record()
@@ -241,6 +243,7 @@ def test_compare_special_properties():
         assert len(diff_r1["properties"]) == 0
         assert len(diff_r2["properties"]) == 0
 
+
 def test_compare_importances():
     r1 = db.Record()
     r2 = db.Record()
@@ -253,7 +256,7 @@ def test_compare_importances():
     for diff in (diff_r1, diff_r2):
         assert len(diff["properties"]["test"]) == 1
         assert len(diff["parents"]) == 0
-    
+
 
 def test_compare_properties():
     p1 = db.Property()
@@ -262,13 +265,14 @@ def test_compare_properties():
     with pytest.raises(NotImplementedError, match=".*abstract properties.*"):
         compare_entities(p1, p2)
 
+
 def test_multi_properties():
     # This test is rather lengthy, because:
     # - previously the check for multi-properties was only implemented for the
     #   new_entity paramter of the function.
     # - Because of the API of pylib the behavior depended on the order of adding the
     #   properties to the records.
-    
+
     r1 = db.Record()
     r2 = db.Record()
     r1.add_property("test", value=2)
@@ -299,7 +303,7 @@ def test_multi_properties():
     # assert empty_diff(r1, r2)
     with pytest.raises(NotImplementedError, match=".*multi-properties.*"):
         compare_entities(r1, r2)
-    
+
     r1 = db.Record()
     r2 = db.Record()
     r1.add_property("test", value=4)