def to_python(self, value):
        if isinstance(value, self._coerce_to) or not value:
            return value
        return self._coerce_to(value)
Schedule task to SWF as child workflow and wait. If the task is not
dataset/ETHPy150Open lukesneeringer/django-pgfields/django_pg/models/fields/uuid.py/UUIDField.to_python--crossover with--dataset/ETHPy150Open KKBOX/mass/mass/scheduler/swf/__init__.py/SWFDecider.execute_task