solve multiple inheritance of meta classes

pype/lib/abstract_collect_render.py

@@ -13,6 +13,7 @@ from avalon import api
 import pyblish.api
 
 from .abstract_expected_files import ExpectedFiles
+from .abstract_metaplugins import AbstractMetaContextPlugin
 
 
 @attr.s
@@ -101,8 +102,7 @@ class RenderInstance(object):
             raise ValueError("both tiles X a Y sizes are set to 1")
 
 
-@six.add_metaclass(ABCMeta)
+class AbstractCollectRender(AbstractMetaContextPlugin):
-class AbstractCollectRender(pyblish.api.ContextPlugin):
     """Gather all publishable render layers from renderSetup."""
 
     order = pyblish.api.CollectorOrder + 0.01

pype/lib/abstract_metaplugins.py

@@ -0,0 +1,10 @@
+from abc import ABCMeta
+from pyblish.api import InstancePlugin, ContextPlugin
+
+
+class AbstractMetaInstancePlugin(ABCMeta, InstancePlugin):
+    pass
+
+
+class AbstractMetaContextPlugin(ABCMeta, ContextPlugin):
+    pass

pype/lib/abstract_submit_deadline.py

@@ -15,6 +15,7 @@ import attr
 import requests
 
 import pyblish.api
+from .abstract_metaplugins import AbstractMetaInstancePlugin
 
 
 @attr.s
@@ -350,8 +351,8 @@ class DeadlineJobInfo:
         return serialized
 
 
-@six.add_metaclass(ABCMeta)
+@six.add_metaclass(AbstractMetaInstancePlugin)
-class AbstractSubmitDeadline(pyblish.api.InstancePlugin):
+class AbstractSubmitDeadline:
     """Class abstracting access to Deadline."""
 
     label = "Submit to Deadline"