Solving environment: failed InvalidVersionSpecError: Invalid version spec: =2.7_solving environment: failed invalidversionspecerro

#Solving environment: failed InvalidVersionSpecError: Invalid version spec: =2.7
#安装tensorflow-gpu=1.13.1，报错

下面记录使用尝试的解决方法：
最终解决方法来自下面文章的第三种方法
https://blog.csdn.net/weixin_38943436/article/details/109137604?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-2.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-2.control
1.在虚拟环境中更新conda报错

2. 换不同方式更新conda，问题没解决
   
   3.删除 .condarc文件，(记得备份一下.condarc，以防不测)，成功安装