scrapy : Could not find a version that satisfies the requirement Twisted>=13.1.0 (from Scrapy) (from versions: )

错误

在安装scrapy的时候，如果机器是一个纯净的机器，那么大多数情况下会出现以下错误：

1 2	Could not find a version that satisfies the requirement Twisted>=13.1.0 (from Scrapy) (from versions: ) No matching distribution found for Twisted>=13.1.0 (from Scrapy)

解决办法

前往官网下载，官网下载： http://twistedmatrix.com/trac/wiki/Downloads

wget https://twistedmatrix.com/Releases/Twisted/19.2/Twisted-19.2.1.tar.bz2
tar -jxvf Twisted-19.2.1.tar.bz2
cd Twisted-19.2.1
python setup.py install

如果需要在虚拟环境中安装，那么进入虚拟环境后再执行安装命令即可。