diff --git a/src/gen/lib/addressbase.py b/src/gen/lib/addressbase.py
index 526998abc..b0296ea96 100644
--- a/src/gen/lib/addressbase.py
+++ b/src/gen/lib/addressbase.py
@@ -52,8 +52,7 @@ class AddressBase:
         @type source: AddressBase
         """
         if source:
-            self.address_list = [ Address(address) \
-                                      for address in source.address_list ]
+            self.address_list = [Address(addr) for addr in source.address_list]
         else:
             self.address_list = []
 
diff --git a/src/gen/lib/family.py b/src/gen/lib/family.py
index 7e167d63f..bdafcaa85 100644
--- a/src/gen/lib/family.py
+++ b/src/gen/lib/family.py
@@ -139,16 +139,10 @@ class Family(SourceBase, NoteBase, MediaBase, AttributeBase, LdsOrdBase,
         self.marker.unserialize(marker)
         self.type = FamilyRelType()
         self.type.unserialize(the_type)
-        self.event_ref_list = []
-        for er in event_ref_list:
-            eventref = EventRef()
-            eventref.unserialize(er)
-            self.event_ref_list.append(eventref)
-        self.child_ref_list = []
-        for cr in child_ref_list:
-            childref = ChildRef()
-            childref.unserialize(cr)
-            self.child_ref_list.append(childref)
+        self.event_ref_list = [EventRef().unserialize(er)
+                               for er in event_ref_list]
+        self.child_ref_list = [ChildRef().unserialize(cr)
+                               for cr in child_ref_list]
         MediaBase.unserialize(self, media_list)
         AttributeBase.unserialize(self, attribute_list)
         SourceBase.unserialize(self, source_list)
diff --git a/src/gen/lib/note.py b/src/gen/lib/note.py
index c4b45c352..c4eb51e45 100644
--- a/src/gen/lib/note.py
+++ b/src/gen/lib/note.py
@@ -24,13 +24,6 @@
 Note class for GRAMPS.
 """
 
-#-------------------------------------------------------------------------
-#
-# standard python modules
-#
-#-------------------------------------------------------------------------
-from types import InstanceType
-
 #-------------------------------------------------------------------------
 #
 # GRAMPS modules
@@ -81,9 +74,9 @@ class Note(BasicPrimaryObject):
         (self.handle, self.gramps_id, self.text, self.format,
          the_type, self.change, the_marker, self.private) = data
 
-        self.marker = InstanceType(MarkerType)
+        self.marker = MarkerType()
         self.marker.unserialize(the_marker)
-        self.type = InstanceType(NoteType)
+        self.type = NoteType()
         self.type.unserialize(the_type)
 
     def get_text_data_list(self):
diff --git a/src/gen/lib/person.py b/src/gen/lib/person.py
index 13b79f5b8..2429a4c5a 100644
--- a/src/gen/lib/person.py
+++ b/src/gen/lib/person.py
@@ -187,21 +187,12 @@ class Person(SourceBase, NoteBase, AttributeBase, MediaBase,
         self.marker.unserialize(marker)
         self.primary_name = Name()
         self.primary_name.unserialize(primary_name)
-        self.alternate_names = []
-        for name in alternate_names:
-            n = Name()
-            n.unserialize(name)
-            self.alternate_names.append(n)
-        self.event_ref_list = []
-        for er in event_ref_list:
-            eventref = EventRef()
-            eventref.unserialize(er)
-            self.event_ref_list.append(eventref)
-        self.person_ref_list = []
-        for pr in person_ref_list:
-            personref = PersonRef()
-            personref.unserialize(pr)
-            self.person_ref_list.append(personref)
+        self.alternate_names = [Name().unserialize(name)
+                                for name in alternate_names]
+        self.event_ref_list = [EventRef().unserialize(er)
+                               for er in event_ref_list]
+        self.person_ref_list = [PersonRef().unserialize(pr)
+                                for pr in person_ref_list]
         MediaBase.unserialize(self, media_list)
         LdsOrdBase.unserialize(self, lds_ord_list)
         AddressBase.unserialize(self, address_list)
diff --git a/src/gen/lib/place.py b/src/gen/lib/place.py
index d15fd6246..8e0501036 100644
--- a/src/gen/lib/place.py
+++ b/src/gen/lib/place.py
@@ -124,13 +124,8 @@ class Place(SourceBase, NoteBase, MediaBase, UrlBase, PrimaryObject):
         if main_loc is None:
             self.main_loc = None
         else:
-            self.main_loc = Location()
-            self.main_loc.unserialize(main_loc)
-        self.alt_loc = []
-        for al in alt_loc:
-            location = Location()
-            location.unserialize(al)
-            self.alt_loc.append(location)
+            self.main_loc = Location().unserialize(main_loc)
+        self.alt_loc = [Location().unserialize(al) for al in alt_loc]
         self.marker = MarkerType()
         self.marker.unserialize(marker)
         UrlBase.unserialize(self, urls)
diff --git a/src/gen/lib/src.py b/src/gen/lib/src.py
index a0ba323d2..4ddc8d4cf 100644
--- a/src/gen/lib/src.py
+++ b/src/gen/lib/src.py
@@ -82,11 +82,7 @@ class Source(MediaBase, NoteBase, PrimaryObject):
         self.marker.unserialize(marker)
         NoteBase.unserialize(self, note_list)
         MediaBase.unserialize(self, media_list)
-        self.reporef_list = []
-        for rr in reporef_list:
-            reporef = RepoRef()
-            reporef.unserialize(rr) 
-            self.reporef_list.append(reporef)
+        self.reporef_list = [RepoRef().unserialize(rr) for rr in reporef_list]
         
     def _has_handle_reference(self, classname, handle):
         """
diff --git a/src/gen/lib/srcbase.py b/src/gen/lib/srcbase.py
index 136782f9e..b8d7df2c4 100644
--- a/src/gen/lib/srcbase.py
+++ b/src/gen/lib/srcbase.py
@@ -63,11 +63,7 @@ class SourceBase:
         """
         Convert a serialized tuple of data to an object.
         """
-        self.source_list = []
-        for item in data:
-            sourceref = SourceRef()
-            sourceref.unserialize(item) 
-            self.source_list.append(sourceref)
+        self.source_list = [SourceRef().unserialize(item) for item in data]
 
     def add_source_reference(self, src_ref) :
         """