设置 Pypi 源 `~/.pip/pip.conf`

[global]
index-url = http://pypi.douban.com/simple

[install]
trusted-host = pypi.douban.com

在全新安装的 Ubuntu 中安装 Scrapy

sudo apt-get install python-dev python-pip libxml2-dev libxslt1-dev zlib1g-dev libffi-dev libssl-dev
pip install scrapy