今天打开pycharm创建了一个python3.8的虚拟环境，然后使用命令pip install scrapy结果失败了，报一下错误：
Could not find a version that satisfies the requirement cffi!=1.11.3,>=1.8 (from versions: )
No matching distribution found for cffi!=1.11.3,>=1.8
You are using pip version 10.0.1, however version 20.1b1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
坎坷路：
安装失败，根据提示升级pip：python -m pip install --upgrade pip 结果升级失败了！
然后又用命令：python -m pip install -U pip 还是失败。。。
最后成功：
使用命令重新安装pip：python -m pip install --upgrade pip --force-reinstall
然后安装scrapy：pip install scrapy
成功！
