1、升级pip
python -m pip install --upgrade pip
2、下载twisted(win7系统64位)
https://download.lfd.uci.edu/pythonlibs/r5uhg2lo/ad3-2.2.1-cp37-cp37m-win_amd64.whl
3、安装twisted
pip install E:\python\Twisted-18.9.0-cp37-cp37m-win_amd64.whl
4、安装scrapy
pip3 install scrapy