pip install --upgrade sqlalchemy 给出超出最大递归深度

我试过了pip install --upgrade sqlalchemy, python2.7 setup.py install，并在删除站点包中的 sqlalchemy 文件夹后，我尝试过pip install sqlalchemy。它们都给出“RuntimeError：cmp 中超出最大递归深度”。

  File "C:\Python27\lib\ntpath.py", line 200, in splitext
return genericpath._splitext(p, sep, altsep, extsep)
  File "C:\Python27\lib\genericpath.py", line 102, in _splitext
    sepIndex = max(sepIndex, altsepIndex)
RuntimeError: maximum recursion depth exceeded in cmp

我还尝试运行 v0.9 的 setup.py 并得到相同的结果。 尝试在 setup.py 中添加一行以将最大递归设置为 10000 并且 python 崩溃。

编辑：回溯是一个很长的重复：

 File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\setuptools\dist.py", line 225, in __init__
    _Distribution.__init__(self,attrs)
  File "c:\python27\lib\distutils\dist.py", line 287, in __init__
    self.finalize_options()
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\setuptools\dist.py", line 257, in finalize_options
    ep.require(installer=self.fetch_build_egg)
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\pkg_resources.py", line 2029, in require
    working_set.resolve(self.dist.requires(self.extras),env,installer))
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\pkg_resources.py", line 580, in resolve
    dist = best[req.key] = env.best_match(req, self, installer)
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\pkg_resources.py", line 825, in best_match
    return self.obtain(req, installer) # try and download/install
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\pkg_resources.py", line 837, in obtain
    return installer(requirement)
  File "c:\python27\lib\site-packages\distribute-0.6.28-py2.7.egg\setuptools\dist.py", line 272, in fetch_build_egg
    dist = self.__class__({'script_args':['easy_install']})
{repeat until max recursion}

看起来我的“distribute”（v0.6xxx）已经过时了。 我跑了

pip install --upgrade distribute 

它安装了0.7.3。

然后跑了pip install sqlalchemy并安装了。

安装其他软件包时遇到同样的问题。