请问Python2.7 Ubuntu14.10 pip1.5.6提示readline()是什么错误，,今天在用pip1.5.6

请问Python2.7 Ubuntu14.10 pip1.5.6提示readline()是什么错误，,今天在用pip1.5.6

今天在用pip1.5.6安装flask-mongoengine的时候报错退出
我执行的命令是

bashpip install flask-mongoengine

返回错误是

bashDownloading/unpacking flask-mongoengineCleaning up...Exception:Traceback (most recent call last):  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main    status = self.run(options, args)  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 278, in run    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1177, in prepare_files    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 194, in find_requirement    page = self._get_page(main_index_url, req)  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 568, in _get_page    session=self.session,  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 670, in get_page    resp = session.get(url, headers={"Accept": "text/html"})  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 468, in get    return self.request('GET', url, **kwargs)  File "/usr/lib/python2.7/dist-packages/pip/download.py", line 237, in request    return super(PipSession, self).request(method, url, *args, **kwargs)  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 456, in request    resp = self.send(prep, **send_kwargs)  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 559, in send    r = adapter.send(request, **kwargs)  File "/usr/lib/python2.7/dist-packages/requests/adapters.py", line 327, in send    timeout=timeout  File "/usr/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 491, in urlopen    conn = self._get_conn(timeout=pool_timeout)  File "/usr/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 230, in _get_conn    return conn or self._new_conn()  File "/usr/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 680, in _new_conn    return self._prepare_conn(conn)  File "/usr/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 653, in _prepare_conn    conn.connect()  File "/usr/lib/python2.7/dist-packages/urllib3/connection.py", line 205, in connect    self._tunnel()  File "/usr/lib/python2.7/httplib.py", line 780, in _tunnel    line = response.fp.readline(_MAXLINE + 1)TypeError: readline() takes exactly 1 argument (2 given)

我看traceback怀疑是标准库的bug，就google了一下，发现了一个github上的issue,场景不一样但是引发了同样的bug。这个issue最后讨论的结论是这确实是个bug，但是相关的patch已经merge了，就是说问题应该已经解决了。我在issue后面回复了我的问题，不过还没有得到解决。不知道有没有哪位遇到过类似的问题并且已经解决了？
我的python版本是2.7.9，pip版本是1.5.6，系统是ubuntu14.10.

编橙之家文章，