EL CAPITAN更新

Question

在最近的El Capitan更新后，当我打开终端时，我收到以下错误而没有尝试任何操作。

    Traceback (most recent call last):
      File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
      File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
      File "/usr/local/lib/python2.7/site-packages/virtualenvwrapper/hook_loader.py", line 8, in <module>
        import inspect
      File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py", line 39, in <module>
        import tokenize
      File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tokenize.py", line 29, in <module>
        from itertools import chain
    ImportError: No module named itertools
    virtualenvwrapper.sh: There was a problem running the initialization hooks. 

    If Python could not import the module virtualenvwrapper.hook_loader,
    check that virtualenvwrapper has been installed for
    VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python and that PATH is
    set properly.

如果我在命令行中运行python（2.7.9）它可以工作，但是当我尝试导入没有模块zlib错误的zlib时它会失败。

我尝试通过简单安装重新安装pip，所以我可以重新安装virtualenv和virtualenvwrapper，但是当我尝试sudo easy install时，我得到＆＃34; zipimport.ZipImportError：无法解压缩数据; zlib不可用＆＃34;。

所以我接着尝试改变.bash_profile，但我真的不知道如何改变它，因为我不了解路径和环境变量。 CURRENT bash_profile内容为：

export PATH=/usr/local/share/python:$PATH
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh

我最后的希望是，如果我能指出正确方向的道路，一切都会得到解决。