new_contents: from django.core.management import BaseCommand
  
  from crawler.models import *
  
  
  class Command(BaseCommand):
      help = 'Calculate recommendation accuracy per user'
  
      def handle(self, *args, **options):
          result_dict = dict()
          users = User.objects.all()
  
          for user in users:
              count = 0
              recommended_apps = user.recommended_apps.all()
              recommended_apps_count = len(recommended_apps)
              for app in recommended_apps:
                  if user.userapps_set.filter(package_name=app.package_name).exists():
                      count = count + 1
  
              percentage = float(count) / recommended_apps_count
              if percentage not in result_dict:
                  result_count = 0
              else:
                  result_count = result_dict[percentage]
  
              result_dict[percentage] = result_count + 1
  
          admin_file = open('recommendation_accuracy', 'w')
          admin_file.write('Percentage of Recommended Installed;Instances Count\n')
          for key in result_dict:
              admin_file.write('{};{}\n'.format(key, result_dict[key]))
          admin_file.close()
  
subject: Create command to calculate recommendation's accuracy