Anaconda 创建虚拟环境时遇到CondaHTTPError: HTTP 404 NOT FOUND for url的问题及解决办法

1、解决办法：

在用户目录下（如win10中C:\Users\Administrator\），修改.condarc文件，内容替换如下：

channels:
  - defaults
show_channel_urls: true
channel_alias: https://repo.anaconda.com
default_channels:
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/free
  - https://repo.anaconda.com/pkgs/r
  - https://repo.anaconda.com/pkgs/pro
  - https://repo.anaconda.com/pkgs/msys2
custom_channels:
  conda-forge: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  msys2: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  bioconda: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  menpo: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  pytorch: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  simpleitk: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud

关键点在于：default_channels用的官方的源，custom_channels用的清华的源。

问题最终得以解决。