Using ABCHasStrictTraits

force_bdss/data_sources/base_data_source_model.py

 import abc
-import six
+from traits.api import ABCHasStrictTraits
 
 
-class BaseDataSourceModel(six.with_metaclass(abc.ABCMeta)):
+class BaseDataSourceModel(ABCHasStrictTraits):
     @classmethod
     @abc.abstractmethod
     def from_json(self, model_data):

force_bdss/kpi/base_kpi_calculator_model.py

-import six
 import abc
+from traits.has_traits import ABCHasStrictTraits
 
 
-class BaseKPICalculatorModel(six.with_metaclass(abc.ABCMeta)):
+class BaseKPICalculatorModel(ABCHasStrictTraits):
     @classmethod
     @abc.abstractmethod
     def from_json(self, model_data):

force_bdss/mco/base_mco_model.py

 import abc
-import six
+from traits.api import ABCHasStrictTraits
 
 
-class BaseMCOModel(six.with_metaclass(abc.ABCMeta)):
+class BaseMCOModel(ABCHasStrictTraits):
     @classmethod
     @abc.abstractmethod
     def from_json(self, model_data):