linux: ubuntu16.04-64bit
python: 3.5.2

1. 安装环境

   sudo apt-get install build-essential
   sudo apt-get install python3-dev
   sudo apt-get install libxml2-dev
   sudo apt-get install libxslt1-dev
   sudo apt-get install python3-setuptools
   
   sudo apt-get install libssl-dev
   apt-get install -y libffi-dev
   pip3 install Twisted
   pip3 install w3lib
   pip3 install lxm
   

2. 安装Scrapy: [scrapy运行必备组件需要(OpenSSL, lxml(lxml一般默认有安装，可以import xml验证是否有安装))]
   sudo python3 -m pip install Scrapy

3. 安装OpenSSL:
   sudo python3 -m pip install pyopenssl

4. 重新安装python3版本的这两个软件:
   sudo apt-get install python3-dev
sudo apt-get install python3-setuptools