解决Mac安装scrapy失败的问题

Installing collected packages: six, w3lib, parsel, pyasn1, pyasn1-modules, attrs, service-identity, 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/r9/35q9g3d56_d9g0v59w9x2l9w0000gn/T/pip-oWMyqW-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'

brew install python