安装前的准备工作
若你的Mac OS系统为10.11或更高版本：
重新启动Mac OS
重启时按住Command+R，进入Recovery模式
打开命令行终端输入: csrutil disable
重新启动，回到Mac OS
安装Scrapy
sudo -H pip install Scrapy
查看scrapy版本
scrapy version
报错：
Traceback (most recent call last):
File "/usr/local/bin/scrapy", line 7, in <module>
from scrapy.cmdline import execute
File "/Library/Python/2.7/site-packages/scrapy/cmdline.py", line 9, in <module>
from scrapy.crawler import CrawlerProcess
File "/Library/Python/2.7/site-packages/scrapy/crawler.py", line 7, in <module>
from twisted.internet import reactor, defer
File "/Library/Python/2.7/site-packages/twisted/internet/reactor.py", line 38, in <module>
from twisted.internet import default
File "/Library/Python/2.7/site-packages/twisted/internet/default.py", line 56, in <module>
install = _getInstallFunction(platform)
File "/Library/Python/2.7/site-packages/twisted/internet/default.py", line 50, in _getInstallFunction
from twisted.internet.selectreactor import install
File "/Library/Python/2.7/site-packages/twisted/internet/selectreactor.py", line 18, in <module>
from twisted.internet import posixbase
File "/Library/Python/2.7/site-packages/twisted/internet/posixbase.py", line 18, in <module>
from twisted.internet import error, udp, tcp
File "/Library/Python/2.7/site-packages/twisted/internet/tcp.py", line 28, in <module>
from twisted.internet._newtls import (
File "/Library/Python/2.7/site-packages/twisted/internet/_newtls.py", line 21, in <module>
from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol
File "/Library/Python/2.7/site-packages/twisted/protocols/tls.py", line 63, in <module>
from twisted.internet._sslverify import _setAcceptableProtocols
File "/Library/Python/2.7/site-packages/twisted/internet/_sslverify.py", line 38, in <module>
TLSVersion.TLSv1_1: SSL.OP_NO_TLSv1_1,
AttributeError: 'module' object has no attribute 'OP_NO_TLSv1_1'
安装指定版本的twisted
//由于twisted版本过高
sudo pip install twisted==13.1.0
再次检查scrapy是否安装成功
scrapy version
//Scrapy 1.4.0
