将 blob 写入 blobstore

Question

我尝试使用此处描述的方法写入 blobstore：

http ://code.google.com/appengine/docs/python/blobstore/overview.html#Writing_Files_to_the_Blobstore

我尝试使用remote_api来执行以下代码：

file_name = files.blobstore.create(mime_type='text/html',_blobinfo_uploaded_filename='sample.txt')
with files.open(file_name, 'a') as f:
    f.write('sample text for the sample blob')
files.finalize(file_name)

总是会引发错误（在上面的第三行）：

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\file
s\file.py", line 310, in write
    self._make_rpc_call_with_retry('Append', request, response)
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\file
s\file.py", line 388, in _make_rpc_call_with_retry
    _make_call(method, request, response)
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\file
s\file.py", line 236, in _make_call
    _raise_app_error(e)
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\file
s\file.py", line 179, in _raise_app_error
    raise FileNotOpenedError()
FileNotOpenedError

我尝试写入的文件非常小（< 20KB），因此它不是配额问题。我还缺少其他步骤吗？

Answer 1

也许您可能需要添加以下模块，但如果您之前没有添加。

    from __future__ import with_statement 
 -->from google.appengine.api import files
    from google.appengine.ext import blobstore
    from google.appengine.ext.webapp import blobstore_handlers


    file_name = files.blobstore.create(mime_type='text/plain',_blobinfo_uploaded_filename='sample.txt')
    with files.open(file_name, 'a') as f:
         f.write('sample text for the sample blob') 
    files.finalize(file_name)