scrapy框架安装过程报错

Failed cleaning build dir for cryptography Failed to build cryptography
Could not build wheels for cryptography
which use PEP 517 and cannot be installed directly

pip版本太低，升级

https://ask.csdn.net/questions/7418184

https://blog.csdn.net/weixin_56151429/article/details/115581737

https://cloud.tencent.com/developer/article/2151505

pip升级过程中报错

1、权限原因：

使用管理员打开cmd窗口再次执行升级命令

2、如果在执行pip install --upgrade pip命令提示更新失败或是警告，再次使用pip提示“ModuleNotFoundError: No module named 'pip' ”错误

解决办法：

python -m ensurepip 

python -m pip install --upgrade pip

ps：https://jingyan.baidu.com/article/6f2f55a19fad97f4b93e6c80.html