new_contents: from optparse import make_option
  from django.core.management.base import BaseCommand
  from django.contrib.auth.models import User
  from student.models import CourseEnrollment
  from shoppingcart.models import CertificateItem
  
  
  class Command(BaseCommand):
      help = """
      This command takes two course ids as input and transfers
      all students enrolled in one course into the other.  This will
      remove them from the first class and enroll them in the second
      class in the same mode as the first one. eg. honor, verified,
      audit.
  
      example:
          # Transfer students from the old demoX class to a new one.
          manage.py ... transfer_students -f edX/Open_DemoX/edx_demo_course -t edX/Open_DemoX/new_demoX
      """
  
      option_list = BaseCommand.option_list + (
          make_option('-f', '--from',
                      metavar='SOURCE_COURSE',
                      dest='source_course',
                      help='The course to transfer students from.'),
          make_option('-t', '--to',
                      metavar='DEST_COURSE',
                      dest='dest_course',
                      help='The new course to enroll the student into.'),
      )
  
      def handle(self, *args, **options):
          source = options['source_course']
          dest = options['dest_course']
  
          source_students = User.objects.filter(
              courseenrollment__course_id=source,
              courseenrollment__is_active=True)
  
          for user in source_students:
              print("Moving {}.".format(user.username))
              # Find the old enrollment.
              enrollment = CourseEnrollment.objects.get(user=user,
                  course_id=source)
              # Move the Student between the classes.
              mode = enrollment.mode
              CourseEnrollment.unenroll(user,source)
              CourseEnrollment.enroll(user, dest, mode=mode)
  
              if mode == 'verified':
                  try:
                      certificate_item = CertificateItem.objects.get(
                          course_id=source,
                          course_enrollment=enrollment)
                  except CertificateItem.DoesNotExist:
                      print("No certificate for {}".format(user))
                      continue
  
                  new_enrollment = CourseEnrollment.objects.get(user=user,
                      course_id=dest)
  
                  certificate_item.course_id = dest
                  certificate_item.course_enrollment = new_enrollment
                  certificate_item.save()
  
subject: Add a command to transfer students from one course to another.