for i, lesson in enumerate(clessons):
prefix = 'Pelny kurs/%d %s/%d %s/' % (c, section.slug, i, lesson.slug)
lesson.add_to_zip(zipf, student, prefix)
for i, lesson in enumerate(clessons):
prefix = 'Pelny kurs/%d %s/%d %s/' % (c, section.slug, i, lesson.slug)
lesson.add_to_zip(zipf, student, prefix)