参考文章：
https://blog.csdn.net/weixin_38989380/article/details/123505264 https://blog.csdn.net/moshiyaofei/article/details/122061374
1、conda create -n py35 python=3.5.4 出错：SyntaxError: invalid syntax
改为：conda create -n py35 python==3.5.4
2、pip install tensorflow1.8.0 出错：ERROR: No matching distribution found for tensorflow1.8.0
当前环境python版本太高了 进入3.5.4的环境再安装：conda activate py35
3、下载tensorflow过慢的问题
换个镜像：pip install tensorflow==1.8.0 -i https://pypi.douban.com/simple
4、下载tensorflow出错：ERROR: Failed building wheel for grpcio
https://blog.csdn.net/weixin_47807140/article/details/120961424
