def validate ( self, object, name, value ):
        try:
            if issubclass( value, self.klass ):
                return value
        except:
            if (value is None) and (self._allow_none):
                return value

        self.error( object, name, value )
CSV format suitable for importing into google GMail
dataset/ETHPy150Open enthought/traits/traits/trait_types.py/Type.validate--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/django-extensions-1.5.0/django_extensions/management/commands/export_emails.py/Command.google