（自用）存一下pycharm下载安装包时的各种命令

D:\Pycharm\python\python3.8\python3.8\python.exe -m pip install -i https://pypi.tuna.tsinghua.edu.cn/simple

C:\Python38\python.exe -m pip install -i https://pypi.tuna.tsinghua.edu.cn/simple

conda install --channel https://pypi.tuna.tsinghua.edu.cn/simple tensorflow==1.12.0

conda install tensorflow==1.12.0

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple tensorflow==1.12.0