Use ABC on ScheduledExternalProgramTask and ScheduledTask

Author: arteymix

bioluigi/scheduled_external_program.py

@@ -9,6 +9,7 @@
 
 import datetime
 import os
+from abc import ABC
 from datetime import timedelta
 from typing import Optional
 
@@ -19,7 +20,7 @@
 
 cfg = BioluigiConfig()
 
-class ScheduledExternalProgramTask(ScheduledTask, luigi.Task):
+class ScheduledExternalProgramTask(ScheduledTask, ABC):
     """
     Variant of :class:`luigi.contrib.external_program.ExternalProgramTask` that
     executes the task with a :class:`Scheduler`.

bioluigi/schedulers.py

@@ -17,7 +17,7 @@
 
 cfg = BioluigiConfig()
 
-class ScheduledTask(ABC, luigi.Task):
+class ScheduledTask(luigi.Task, ABC):
     """Interface for Luigi tasks that can be scheduled."""
     walltime: timedelta