如何解决Google Cloudstorage客户端问题？

Given the sample code:

给出示例代码：

import cloudstorage
from django.shortcuts import render

def list_files(request):
  file_list = []
  try:
    bucket_name = my_bucket
    gcs_list_obj = cloudstorage.listbucket('/' + bucket_name, delimiter="/")
    for item in gcs_list_obj:
        file_list.append(item)

  except Exception, e:
    raise e

  return render(request, 'default.htm', {'file_list': file_list,
                                       'bucket_name': bucket_name})
import cloud