docs: def import_data_dir(target_zip):
      """
      Imports the data specified by param <target_zip>. Renames the data dir if it already exists and
      unpacks the zip sub dir __data__ directly within the current active product.
      :param target_zip: string path to the zip file.
      """
      from django_productline.context import PRODUCT_CONTEXT
  
      new_data_dir = '{data_dir}_before_import_{ts}'.format(
          data_dir=PRODUCT_CONTEXT.DATA_DIR,
          ts=datetime.datetime.now().strftime("%Y-%m-%d.%H:%M:%S:%s")
      )
  
      if os.path.exists(PRODUCT_CONTEXT.DATA_DIR):
          # rename an existing data dir if it exists
          tasks.mv_data_dir(new_data_dir)
  
      z = zipfile.ZipFile(target_zip)
  
      def filter_func(x):
          return x.startswith('__data__/')
  
      z.extractall(os.path.dirname(PRODUCT_CONTEXT.DATA_DIR), filter(filter_func, z.namelist()))