Python访问Google Spreadsheet返回403错误

我想通过Python访问Google表单：

 import gspread
from oauth2client.service_account import ServiceAccountCredentials
import json
GDriveJSON = 'D:\毕业设计\PythonUpload.json'
GSpreadSheet = 'New Stories'
json_key = json.load(open(r'D:\毕业设计\PythonUpload.json'))
scope = ['https://spreadsheets.google.com/feeds']
credentials = ServiceAccountCredentials.from_json_keyfile_name(GDriveJSON, scope)
gc = gspread.authorize(credentials)

但是在打开的时候：

 ws = gc.open(GSpreadSheet).sheet1

返回了403错误：

 Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\Program Files\Python36\lib\site-packages\gspread\client.py", line 122, in open
    self.list_spreadsheet_files()
  File "D:\Program Files\Python36\lib\site-packages\gspread\client.py", line 96, in list_spreadsheet_files
    res = self.request('get', url, params=params).json()
  File "D:\Program Files\Python36\lib\site-packages\gspread\client.py", line 79, in request
    raise APIError(response)
gspread.exceptions.APIError: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "insufficientPermissions",
    "message": "Insufficient Permission"
   }
  ],
  "code": 403,
  "message": "Insufficient Permission"
 }
}

请问应该怎么修改呢？

403是权限问题（Insufficient Permission，权限不足），credentials 这个检查下。