def clean(pr):
'''PlayRecord --> PlayRecord
Clean up a record so it can be stored.
Raise ValueError on incomplete data.
'''
# decompose
title, artist, played = pr
# construct
pr = clean_string(title), clean_string(artist), int(played)
# validate
if all(pr):
return pr
else:
raise ValueError('invalid PlayRecord {}'.format(pr))
def song(render=json.dumps):
song, artist = db.get_randsong()
return render(dict(
song=clean_string(song),
artist=clean_string(artist),
))