old_contents: import subprocess
  from django.core.cache import cache
  from django.core.management import BaseCommand
  
  
  def set_git_short_ref():
      cache.set(
          'gitref',
          subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']),
          60 * 60 * 365
      )
  
  
  class Command(BaseCommand):
  
      help = 'Cleans up cache etc.'
  
      def handle(self, *args, **options):
          set_git_short_ref()
  
new_contents: import subprocess
  
  from django.core.cache import cache
  from django.core.management import BaseCommand
  
  
  def set_git_short_ref():
      cache.set(
          'gitref',
          subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']),
          60 * 60 * 365
      )
  
  
  class Command(BaseCommand):
  
      help = 'Reset cache etc.'
  
      def handle(self, *args, **options):
          set_git_short_ref()
  
subject: Fix isort warning