UnavailableInvalidChannel: The channel is not accessible or is invalid error code: 404

一、问题

conda安装包报错

UnavailableInvalidChannel: The channel is not accessible or is invalid.
channel name: anaconda/pkgs/free
channel url: https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
error code: 404

You will need to adjust your conda configuration to proceed.
Use conda config --show channels to view your configuration's current state,
and use conda config --show-sources to view config file locations.

二、原因

读者手动更新过python的源为国内安装源，pip可以正常使用，但是国内源停止了Anaconda镜像，不支持conda安装与更新。

三、解决

1. 使用pip安装或更新package
2. 换回默认源，继续使用conda，操作如下

conda config --remove-key channels