def print_ring_tau(rad, tau):
    n = 0
    for (r, t) in zip(rad, tau):
        print 'Ring %3d: tau = %5.3f out to radius %7.3f days' % (n, t, r)
        n += 1
Attach the workflow to a set of attributes.
dataset/ETHPy150Open mkenworthy/exorings/exorings.py/print_ring_tau--crossover with--dataset/ETHPy150Open rbarrois/django_xworkflows/django_xworkflows/models.py/WorkflowEnabledMeta._add_workflow