old_contents: import logging
  import time
  
  from website.app import init_app
  from website.identifiers.utils import get_top_level_domain, request_identifiers_from_ezid
  
  logger = logging.getLogger(__name__)
  logging.basicConfig(level=logging.INFO)
  
  
  def add_identifiers_to_preprints():
      from osf.models import PreprintService
  
      preprints_without_identifiers = PreprintService.objects.filter(identifiers__isnull=True)
      logger.info('About to add identifiers to {} preprints.'.format(preprints_without_identifiers.count()))
  
      for preprint in preprints_without_identifiers:
          logger.info('Saving identifier for preprint {} from source {}'.format(preprint._id, preprint.provider.name))
  
          ezid_response = request_identifiers_from_ezid(preprint)
          preprint.set_preprint_identifiers(ezid_response)
          preprint.save()
  
          doi = preprint.get_identifier('doi')
          subdomain = get_top_level_domain(preprint.provider.external_url)
          assert subdomain.upper() in doi.value
          assert preprint._id.upper() in doi.value
  
          logger.info('Created DOI {} for Preprint from service {}'.format(doi.value, preprint.provider.name))
          time.sleep(1)
  
      logger.info('Finished Adding identifiers to {} preprints.'.format(preprints_without_identifiers.count()))
  
  
  if __name__ == '__main__':
      init_app(routes=False)
      add_identifiers_to_preprints()
  
new_contents: import logging
  import time
  
  from website.app import init_app
  from website.identifiers.utils import request_identifiers_from_ezid
  
  logger = logging.getLogger(__name__)
  logging.basicConfig(level=logging.INFO)
  
  
  def add_identifiers_to_preprints():
      from osf.models import PreprintService
  
      preprints_without_identifiers = PreprintService.objects.filter(identifiers__isnull=True)
      logger.info('About to add identifiers to {} preprints.'.format(preprints_without_identifiers.count()))
  
      for preprint in preprints_without_identifiers:
          logger.info('Saving identifier for preprint {} from source {}'.format(preprint._id, preprint.provider.name))
  
          ezid_response = request_identifiers_from_ezid(preprint)
          preprint.set_preprint_identifiers(ezid_response)
          preprint.save()
  
          doi = preprint.get_identifier('doi')
          assert preprint._id.upper() in doi.value
  
          logger.info('Created DOI {} for Preprint with guid {} from service {}'.format(doi.value, preprint._id, preprint.provider.name))
          time.sleep(1)
  
      logger.info('Finished Adding identifiers to {} preprints.'.format(preprints_without_identifiers.count()))
  
  
  if __name__ == '__main__':
      init_app(routes=False)
      add_identifiers_to_preprints()
  
subject: Remove check for domain in DOI