Mac OS X El Capitan 下安装 Scrapy

$ pip install scrapy

The directory '/Users/aiyouyou/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/aiyouyou/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting scrapy
Downloading Scrapy-1.2.0-py2.py3-none-any.whl (294kB)
100% |████████████████████████████████| 296kB 40kB/s
Collecting service-identity (from scrapy)
Downloading service_identity-16.0.0-py2.py3-none-any.whl
Collecting Twisted>=10.0.0 (from scrapy)
Collecting lxml (from scrapy)
Collecting parsel>=0.9.3 (from scrapy)
Downloading parsel-1.0.3-py2.py3-none-any.whl
Collecting cssselect>=0.9 (from scrapy)
Downloading cssselect-0.9.2-py2.py3-none-any.whl
Collecting PyDispatcher>=2.0.5 (from scrapy)
Collecting w3lib>=1.15.0 (from scrapy)
Downloading w3lib-1.15.0-py2.py3-none-any.whl
Collecting queuelib (from scrapy)
Downloading queuelib-1.4.2-py2.py3-none-any.whl
Collecting six>=1.5.2 (from scrapy)
Downloading six-1.10.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): pyOpenSSL in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from scrapy)
Collecting pyasn1 (from service-identity->scrapy)
Downloading pyasn1-0.1.9-py2.py3-none-any.whl
Collecting pyasn1-modules (from service-identity->scrapy)
Downloading pyasn1_modules-0.0.8-py2.py3-none-any.whl
Collecting attrs (from service-identity->scrapy)
Downloading attrs-16.2.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): zope.interface>=3.6.0 in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from Twisted>=10.0.0->scrapy)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from zope.interface>=3.6.0->Twisted>=10.0.0->scrapy)

第一种方法: 选择忽略 OS X El Capitan 系统已经安装的 six
$ sudo pip install scrapy --ignore-installed six

第二种方法: 关闭苹果的 SIP (System Integrity Protection)
1. 重启 Mac，按住 Command+R 键直到 Apple logo 出现，进入 Recovery Mode
2. 顶部导航栏，点击 Utilities > Terminal
3. 在 Terminal 中输入 csrutil disable，之后回车
4. 重启 Mac
5. 重启进入MAC之后再次csrutil status
6. 这时候系统会提示System Integrity Protection status: disabled.说明 SIP 功能已经被成功关闭

$ scrapy

$ sudo rm -rf /Library/Python/2.7/site-packages/six*
$ sudo rm -rf /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six*
$ sudo pip install six

$ sudo easy_install --upgrade six