python安装模块时报错 Could not build wheels for cryptography which use PEP 517。。。

报错内容：Could not build wheels for cryptography which use PEP 517 and cannot be installed directly

度的结果是pip版本问题，需要删除pip-{version}.dist-info文件夹后重新升级pip
操作步骤如下

1. 找到python进程下venvLibsite-packages
2. 删除pip-{version}.dist-info文件夹，这里注意不要删错了pip文件夹
   
3. 重新安装pip

python -m pip install --upgrade pip

然后就可以愉快地安装模块啦