use 'ABC' instead of 'ABCMeta'

client/ayon_core/addon/base.py

@@ -9,9 +9,8 @@ import logging
 import threading
 import collections
 from uuid import uuid4
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
-import six
 import appdirs
 import ayon_api
 from semver import VersionInfo
@@ -499,8 +498,7 @@ def is_func_marked(func):
     return getattr(func, _MARKING_ATTR, False)
 
 
-@six.add_metaclass(ABCMeta)
-class AYONAddon(object):
+class AYONAddon(ABC):
     """Base class of AYON addon.
 
     Attributes:

client/ayon_core/addon/interfaces.py

@@ -1,7 +1,5 @@
 from abc import ABCMeta, abstractmethod
 
-import six
-
 from ayon_core import resources
 
 
@@ -15,8 +13,7 @@ class _AYONInterfaceMeta(ABCMeta):
         return str(self)
 
 
-@six.add_metaclass(_AYONInterfaceMeta)
-class AYONInterface:
+class AYONInterface(metaclass=_AYONInterfaceMeta):
     """Base class of Interface that can be used as Mixin with abstract parts.
 
     This is way how AYON addon can define that contains specific predefined

client/ayon_core/host/dirmap.py

@@ -7,18 +7,15 @@ exists is used.
 """
 
 import os
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 import platform
 
-import six
-
 from ayon_core.lib import Logger
 from ayon_core.addon import AddonsManager
 from ayon_core.settings import get_project_settings
 
 
-@six.add_metaclass(ABCMeta)
-class HostDirmap(object):
+class HostDirmap(ABC):
     """Abstract class for running dirmap on a workfile in a host.
 
     Dirmap is used to translate paths inside of host workfile from one

client/ayon_core/host/host.py

@@ -1,15 +1,13 @@
 import os
 import logging
 import contextlib
-from abc import ABCMeta, abstractproperty
-import six
+from abc import ABC, abstractproperty
 
 # NOTE can't import 'typing' because of issues in Maya 2020
 #   - shiboken crashes on 'typing' module import
 
 
-@six.add_metaclass(ABCMeta)
-class HostBase(object):
+class HostBase(ABC):
     """Base of host implementation class.
 
     Host is pipeline implementation of DCC application. This class should help

client/ayon_core/host/interfaces.py

@@ -1,5 +1,4 @@
-from abc import ABCMeta, abstractmethod
-import six
+from abc import ABC, abstractmethod
 
 
 class MissingMethodsError(ValueError):
@@ -106,8 +105,7 @@ class ILoadHost:
         return self.get_containers()
 
 
-@six.add_metaclass(ABCMeta)
-class IWorkfileHost:
+class IWorkfileHost(ABC):
     """Implementation requirements to be able use workfile utils and tool."""
 
     @staticmethod

client/ayon_core/lib/attribute_definitions.py

@@ -91,8 +91,7 @@ class AbstractAttrDefMeta(ABCMeta):
         return obj
 
 
-@six.add_metaclass(AbstractAttrDefMeta)
-class AbstractAttrDef(object):
+class AbstractAttrDef(metaclass=AbstractAttrDefMeta):
     """Abstraction of attribute definition.
 
     Each attribute definition must have implemented validation and

client/ayon_core/lib/local_settings.py

@@ -4,7 +4,7 @@ import os
 import json
 import platform
 from datetime import datetime
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
 # disable lru cache in Python 2
 try:
@@ -24,7 +24,6 @@ try:
 except ImportError:
     import ConfigParser as configparser
 
-import six
 import appdirs
 import ayon_api
 
@@ -133,8 +132,7 @@ class AYONSecureRegistry:
         keyring.delete_password(self._name, name)
 
 
-@six.add_metaclass(ABCMeta)
-class ASettingRegistry():
+class ASettingRegistry(ABC):
     """Abstract class defining structure of **SettingRegistry** class.
 
     It is implementing methods to store secure items into keyring, otherwise

client/ayon_core/pipeline/create/creator_plugins.py

@@ -3,9 +3,7 @@ import copy
 import collections
 from typing import TYPE_CHECKING, Optional
 
-from abc import ABCMeta, abstractmethod
-
-import six
+from abc import ABC, abstractmethod
 
 from ayon_core.settings import get_project_settings
 from ayon_core.lib import Logger
@@ -38,8 +36,7 @@ class CreatorError(Exception):
         super(CreatorError, self).__init__(message)
 
 
-@six.add_metaclass(ABCMeta)
-class ProductConvertorPlugin(object):
+class ProductConvertorPlugin(ABC):
     """Helper for conversion of instances created using legacy creators.
 
     Conversion from legacy creators would mean to lose legacy instances,
@@ -152,8 +149,7 @@ class ProductConvertorPlugin(object):
         self._create_context.remove_convertor_item(self.identifier)
 
 
-@six.add_metaclass(ABCMeta)
-class BaseCreator:
+class BaseCreator(ABC):
     """Plugin that create and modify instance data before publishing process.
 
     We should maybe find better name as creation is only one part of its logic

client/ayon_core/pipeline/publish/abstract_expected_files.py

@@ -1,11 +1,9 @@
 # -*- coding: utf-8 -*-
 """Abstract ExpectedFile class definition."""
-from abc import ABCMeta, abstractmethod
-import six
+from abc import ABC, abstractmethod
 
 
-@six.add_metaclass(ABCMeta)
-class ExpectedFiles:
+class ExpectedFiles(ABC):
     """Class grouping functionality for all supported renderers.
 
     Attributes:

client/ayon_core/pipeline/workfile/workfile_template_builder.py

@@ -15,9 +15,8 @@ import os
 import re
 import collections
 import copy
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
-import six
 from ayon_api import (
     get_folders,
     get_folder_by_path,
@@ -82,8 +81,7 @@ class TemplateLoadFailed(Exception):
     pass
 
 
-@six.add_metaclass(ABCMeta)
-class AbstractTemplateBuilder(object):
+class AbstractTemplateBuilder(ABC):
     """Abstraction of Template Builder.
 
     Builder cares about context, shared data, cache, discovery of plugins
@@ -941,8 +939,7 @@ class AbstractTemplateBuilder(object):
         )
 
 
-@six.add_metaclass(ABCMeta)
-class PlaceholderPlugin(object):
+class PlaceholderPlugin(ABC):
     """Plugin which care about handling of placeholder items logic.
 
     Plugin create and update placeholders in scene and populate them on

client/ayon_core/plugins/publish/extract_review.py

@@ -4,9 +4,8 @@ import copy
 import json
 import shutil
 import subprocess
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
-import six
 import clique
 import speedcopy
 import pyblish.api
@@ -1661,8 +1660,7 @@ class ExtractReview(pyblish.api.InstancePlugin):
         return vf_back
 
 
-@six.add_metaclass(ABCMeta)
-class _OverscanValue:
+class _OverscanValue(ABC):
     def __repr__(self):
         return "<{}> {}".format(self.__class__.__name__, str(self))
 

client/ayon_core/tools/common_models/hierarchy.py

@@ -1,18 +1,16 @@
 import time
 import collections
 import contextlib
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
 import ayon_api
-import six
 
 from ayon_core.lib import NestedCacheItem
 
 HIERARCHY_MODEL_SENDER = "hierarchy.model"
 
 
-@six.add_metaclass(ABCMeta)
-class AbstractHierarchyController:
+class AbstractHierarchyController(ABC):
     @abstractmethod
     def emit_event(self, topic, data, source):
         pass

client/ayon_core/tools/launcher/abstract.py

@@ -1,10 +1,7 @@
-from abc import ABCMeta, abstractmethod
-
-import six
+from abc import ABC, abstractmethod
 
 
-@six.add_metaclass(ABCMeta)
-class AbstractLauncherCommon(object):
+class AbstractLauncherCommon(ABC):
     @abstractmethod
     def register_event_callback(self, topic, callback):
         """Register event callback.

client/ayon_core/tools/loader/abstract.py

@@ -1,5 +1,4 @@
-from abc import ABCMeta, abstractmethod
-import six
+from abc import ABC, abstractmethod
 
 from ayon_core.lib.attribute_definitions import (
     AbstractAttrDef,
@@ -347,8 +346,7 @@ class ActionItem:
         return cls(**data)
 
 
-@six.add_metaclass(ABCMeta)
-class _BaseLoaderController(object):
+class _BaseLoaderController(ABC):
     """Base loader controller abstraction.
 
     Abstract base class that is required for both frontend and backed.

client/ayon_core/tools/workfiles/abstract.py

@@ -1,7 +1,6 @@
 import os
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 
-import six
 from ayon_core.style import get_default_entity_icon_color
 
 
@@ -335,8 +334,7 @@ class WorkareaFilepathResult:
         self.filepath = filepath
 
 
-@six.add_metaclass(ABCMeta)
-class AbstractWorkfilesCommon(object):
+class AbstractWorkfilesCommon(ABC):
     @abstractmethod
     def is_host_valid(self):
         """Host is valid for workfiles tool work.