diff --git a/mesh_f2.py b/mesh_f2.py
index 44d27a8ca5099e9485f396dddc5b8e56b0c2560a..88f503eae4bd5a1c76c95c16e6be705ed5d37941 100644
--- a/mesh_f2.py
+++ b/mesh_f2.py
@@ -375,7 +375,11 @@ class MeshF2(bpy.types.Operator):
 
 
 # registration
-classes = [MeshF2, F2AddonPreferences]
+classes = (
+    MeshF2,
+    F2AddonPreferences,
+)
+
 addon_keymaps = []
 
 
diff --git a/mesh_looptools.py b/mesh_looptools.py
index e3fd302b3174bbe3d158aa11fb2a407391da1fb5..62417f2188038b5171e946917a18e82b611153ea 100644
--- a/mesh_looptools.py
+++ b/mesh_looptools.py
@@ -5100,7 +5100,7 @@ class LoopPreferences(AddonPreferences):
 
 
 # define classes for registration
-classes = [
+classes = (
     VIEW3D_MT_edit_mesh_looptools,
     VIEW3D_PT_tools_looptools,
     LoopToolsProps,
@@ -5113,13 +5113,13 @@ classes = [
     Space,
     LoopPreferences,
     RemoveGP,
-    ]
+)
 
 
 # registering and menu integration
 def register():
-    for c in classes:
-        bpy.utils.register_class(c)
+    for cls in classes:
+        bpy.utils.register_class(cls)
     bpy.types.VIEW3D_MT_edit_mesh_specials.prepend(menu_func)
     bpy.types.WindowManager.looptools = PointerProperty(type=LoopToolsProps)
     update_panel(None, bpy.context)
@@ -5127,8 +5127,8 @@ def register():
 
 # unregistering and removing menus
 def unregister():
-    for c in classes:
-        bpy.utils.unregister_class(c)
+    for cls in classes:
+        bpy.utils.unregister_class(cls)
     bpy.types.VIEW3D_MT_edit_mesh_specials.remove(menu_func)
     try:
         del bpy.types.WindowManager.looptools
diff --git a/mesh_tiny_cad/__init__.py b/mesh_tiny_cad/__init__.py
index 4a9a62f06e90e065a2a56c92e59e655b528bbc24..d614ddcd133884870b8d414bcc32bf7e652f708c 100644
--- a/mesh_tiny_cad/__init__.py
+++ b/mesh_tiny_cad/__init__.py
@@ -59,7 +59,7 @@ def menu_func(self, context):
     self.layout.menu("VIEW3D_MT_edit_mesh_tinycad")
     self.layout.separator()
 
-classes = [
+classes = (
     TinyCADProperties, VIEW3D_MT_edit_mesh_tinycad,
     VTX.TCAutoVTX,
     XALL.TCIntersectAllEdges,
@@ -67,7 +67,7 @@ classes = [
     E2F.TCEdgeToFace,
     CCEN.TCCallBackCCEN, CCEN.TCCircleCenter,
     BIX.TCLineOnBisection
-]
+)
 
 def register():
     register_icons()
diff --git a/pie_menus_official/pie_view_of.py b/pie_menus_official/pie_view_of.py
index 65a2e2621925991a06dc1394d1cedf3e2c9c6984..40b792176a31364f401edd2e1a0d1adda2e40e26 100644
--- a/pie_menus_official/pie_view_of.py
+++ b/pie_menus_official/pie_view_of.py
@@ -42,10 +42,10 @@ class VIEW3D_PIE_view_of(Menu):
         pie.operator("wm.call_menu_pie", text="More", icon='PLUS').name = "VIEW3D_PIE_view_more_of"
 
 
-classes = [
+classes = (
     VIEW3D_PIE_view_more_of,
     VIEW3D_PIE_view_of,
-    ]
+)
 
 addon_keymaps = []