当我试图安装scrapy时，我遇到以下错误 . 以下是我终端的输出，有什么建议吗？ python是2.7，pip是9.0.3来自/Library/Python/2.7/site-packages（python 2.7）

点子安装Scrapy

终端输出（只有最后一个例外部分）

Installing collected packages: six, w3lib, cssselect, lxml, parsel, queuelib, PyDispatcher, attrs, pyasn1, pyasn1-modules, service-identity, hyperlink, constantly, incremental, Automat, Twisted, Scrapy
        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 215, in main
          status = self.run(options, args)
        File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run
          prefix=options.prefix_path,
        File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 778, in install
          requirement.uninstall(auto_confirm=True)
        File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
          paths_to_remove.remove(auto_confirm)
        File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
          renames(path, new_path)
        File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 267, 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: '/var/folders/vy/rptkx52n4w7dswc7svd1pwh40000gn/T/pip-Go6uIL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'