@task.branch
def branch_task(logical_date):
  if int(logical_date.month) % 3 == 0:
    # Months 3 - March, 6 - June, 9 - September, 12 - December
    return 'end_of_quarter_task'
  else:
    # All other months
    return 'regular_monthly_task'


start_task >> branch_task >> end_of_quarter_task >> end_of_quarter_task2

branch_task >> regular_monthly_task >> regular_monthly_task2