1.切换环境 conda activate cpu
2.下载bsddb3-6.2.9-cp37-cp37m-win_amd64.whl
3.使用pip install bsddb3-6.2.9-cp37-cp37m-win_amd64.whl，应该会报错
4.使用conda install 安装报错的包
5.继续安装pip install bsddb3-6.2.9-cp37-cp37m-win_amd64.whl，搞定
