无法在Mac OS El Capitan上安装nltk

Question

我sudo pip install -U nltk按照nltk文档的建议进行了操作。但是，我得到以下输出：

Collecting nltk
  Downloading nltk-3.0.5.tar.gz (1.0MB)
    100% |████████████████████████████████| 1.0MB 516kB/s 
Collecting six>=1.9.0 (from nltk)
  Downloading six-1.9.0-py2.py3-none-any.whl
Installing collected packages: six, nltk
  Found existing installation: six 1.4.1
    DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
    Uninstalling six-1.4.1:
Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 211, in main
    status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 311, in run
    root=options.root_path,
  File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 640, in install
    requirement.uninstall(auto_confirm=True)
  File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 716, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 125, in remove
    renames(path, new_path)
  File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 315, in renames
    shutil.move(old, new)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
    copy2(src, real_dst)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
    copystat(src, dst)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
    os.chflags(dst, st.st_flags)
OSError: [Errno 1] Operation not permitted: '/tmp/pip-7dp3on-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'

基本上，它无法将六个版本从1.4.1升级到1.9.0。我尝试单独执行此操作，但是遇到了相同的错误。

我提到El Capitan是因为有些人在El Capitan上安装其他python时遇到了问题，我想知道这是否是由于这个原因。

有谁知道如何解决这个问题？

Answer 1

这是我解决问题的方式：

首先，安装Xcode CLI：

xcode-select --install

然后重新安装Python：

sudo brew reinstall python

最后，安装nltk：

sudo pip install -U nltk

希望能帮助到你 ：）