old_contents: import os
  
  from google.appengine.api import apiproxy_stub_map
  from google.appengine.api.app_identity import get_application_id
  
  have_appserver = bool(apiproxy_stub_map.apiproxy.GetStub('datastore_v3'))
  
  if not have_appserver:
      from .boot import PROJECT_DIR
      from google.appengine.tools import dev_appserver
      appconfig = dev_appserver.LoadAppConfig(PROJECT_DIR, {},
                                                      default_partition='dev')[0]
  def appid():
      if have_appserver:
          return get_application_id()
      else:
          try:
              return appconfig.application.split('~', 1)[-1]
          except ImportError, e:
              raise Exception("Could not get appid. Is your app.yaml file missing? "
                              "Error was: %s" % e)
  
  on_production_server = 'SERVER_SOFTWARE' in os.environ and not os.environ['SERVER_SOFTWARE'].startswith("Development")
  
new_contents: import os
  
  from google.appengine.api import apiproxy_stub_map
  from google.appengine.api.app_identity import get_application_id
  from google.appengine.api.datastore import Entity, Put
  
  have_appserver = bool(apiproxy_stub_map.apiproxy.GetStub('datastore_v3'))
  
  if not have_appserver:
      from .boot import PROJECT_DIR
      from google.appengine.tools import dev_appserver
      appconfig = dev_appserver.LoadAppConfig(PROJECT_DIR, {},
                                                      default_partition='dev')[0]
  def appid():
      if have_appserver:
          return get_application_id()
      else:
          try:
              return appconfig.application.split('~', 1)[-1]
          except ImportError, e:
              raise Exception("Could not get appid. Is your app.yaml file missing? "
                              "Error was: %s" % e)
  
  on_production_server = 'SERVER_SOFTWARE' in os.environ and not os.environ['SERVER_SOFTWARE'].startswith("Development")
  
  
  def bulk_create(instances):
      """
          Uses AppEngine's bulk Put() call on a number of instances
          this will NOT call save() but it will return the instances
          with their primary_key populated (unlike Django's bulk_create)
      """
  
      from .fields import AncestorKey
  
      def prepare_entity(instance):
          if isinstance(instance.pk, AncestorKey):
              parent = instance.pk._parent_key
          else:
              parent = None
  
          result = Entity(instance._meta.db_table, parent=parent)
  
          for field in instance._meta.fields:
              if field.name == "id": continue
  
              value = None
              key = field.column
  
              value = getattr(instance, field.name)
  
              if field.rel or hasattr(value, "pk"):
                  value = getattr(value, "pk")
  
              result[key] = value
          return result
  
      entities = [ prepare_entity(x) for x in instances ]
  
      keys = Put(entities)
  
      for i in xrange(len(keys)):
          key = keys[i]
  
          if key.parent():
              instances[i]._parent_key = key.parent()
              instances[i].pk.key_id = key.id_or_name()
          else:
              instances[i].id = key.id_or_name()
  
      return instances
  
  
subject: Add a bulk_create function to utils.py