Dropbox API请求令牌在Python 3中无法使用？

Question

我正在维护一个使用官方Dropbox API的Python应用程序。为了让用户允许我的应用使用他们的Dropbox账户，我用一个小脚本，利用了DropboxSession类，这个类在这篇博客中也有介绍：

# Include the Dropbox SDK libraries
from dropbox import client, rest, session

# Get your app key and secret from the Dropbox developer website
APP_KEY = '******'
APP_SECRET = '******'

# ACCESS_TYPE should be 'dropbox' or 'app_folder' as configured for your app
ACCESS_TYPE = 'app_folder'

sess = session.DropboxSession(APP_KEY, APP_SECRET, ACCESS_TYPE)
request_token = sess.obtain_request_token()
url = sess.build_authorize_url(request_token)

# Make the user sign in and authorize this token
print "url:", url
print "Please visit this website and press the 'Allow' button, then hit 'Enter' here."
# Python 2/3 compatibility
try:
    raw_input()
except NameError:
    input()
# This will fail if the user didn't visit the above URL
access_token = sess.obtain_access_token(request_token)

#Print the token for future reference
print access_token

这个脚本在Python 2.7.6中运行得很好，但在Python 3.4中就出问题了（虽然处理了raw_input的问题）。我遇到了这个错误：

Traceback (most recent call last):
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/session.py", line 285, in _parse_token
    key = params['oauth_token'][0]
KeyError: 'oauth_token'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "get_access_token.py", line 12, in <module>
    request_token = sess.obtain_request_token()
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/session.py", line 185, in obtain_request_token
    self.request_token = self._parse_token(response.read())
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/session.py", line 287, in _parse_token
    raise ValueError("'oauth_token' not found in OAuth request.")
ValueError: 'oauth_token' not found in OAuth request.

简单来说，经过研究出错的代码后，我发现Dropbox的代码在查找一个字符串字典的键，但在Python 3中，这些键变成了字节字符串（也就是说，它在查找'oauth_token'，但这里没有，而是b'oauth_token'，这个是存在的）。

不过，即使我修正了代码，想看看这是不是唯一的问题，结果还是不行，后面又出现了另一个错误：

Traceback (most recent call last):
  File "get_access_token.py", line 25, in <module>
    access_token = sess.obtain_access_token(request_token)
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/session.py", line 214, in obtain_access_token
    response = self.rest_client.POST(url, headers=headers, params=params, raw_response=True)
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/rest.py", line 316, in POST
    return cls.IMPL.POST(*n, **kw)
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/rest.py", line 254, in POST
    post_params=params, headers=headers, raw_response=raw_response)
  File "/home/scylardor/.virtualenvs/onitu3/lib/python3.4/site-packages/dropbox/rest.py", line 227, in request
    raise ErrorResponse(r, r.read())
dropbox.rest.ErrorResponse: [401] 'Unauthorized'

所以出问题的函数是sess.obtain_request_token()和sess.obtain_access_token(request_token)。在Python 2.7版本中一切正常，但我希望能兼容Python 3。

那么，有人知道怎么才能让它在Python 3中正常工作吗？难道是故意让它坏掉，以促使大家转向新的流程？我记得之前它在Python 3中是能正常工作的。

如果你有任何想法，非常感谢你的时间 :)

补充：看起来Dropbox的SDK还没有完全兼容Python 3。所以，我想除了等他们更新SDK，别无他法。

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Dropbox API请求令牌在Python 3中无法使用？

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