Python 2.7 在python中使用ete3时出错：'；没有模块名cPickle'；

我遇到的问题类似于：

但是使用ete3（www.etetetoolkit.org）。我降级到ete2，问题消失了，但我想使用ete3中的功能

继上面相关stackoverflow帖子中的评论之后，我已升级到最新版本的“six”（1.10.0），但仍有以下错误消息：

Traceback (most recent call last):
  File "treebuilder.py", line 7, in <module>
    from ete3 import *
  File "/Library/Python/2.7/site-packages/ete3/__init__.py", line 56, in <module>
    from .webplugin.webapp import *
  File "/Library/Python/2.7/site-packages/ete3/webplugin/webapp.py", line 46, in <module>
    import six.moves.cPickle
ImportError: No module named cPickle

---

我该如何解决这个问题？

我的同事通过升级3.5解决了我的问题，但没有该解决方案，我们仍然找不到答案。我的同事通过升级3.5解决了我的问题，但没有该解决方案，我们仍然找不到答案。

Collecting cPickle
/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Could not find a version that satisfies the requirement cPickle (from versions: )
No matching distribution found for cPickle
/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning