python安装sshtunnel时报错：Could not build wheels for bcrypt which use PEP 517 and cannot be installed

python安装sshtunnel时报错：Could not build wheels for bcrypt which use PEP 517 and cannot be installed directly

单独下载bcrypt时依旧报错

用以下方法成功解决：

在setting中单独下载bcrypt时选择较低版本安装，安装成功后再执行命令：pip install -i https://pypi.tuna.tsinghua.edu.cn/simple sshtunnel，

sshtunnel安装成功。