两国毛衣战，让Anaconda更新也受伤。
UnavailableInvalidChannel: The channel is not accessible or is invalid. channel name: anaconda/pkgs/
conda config --remove channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://repo.continuum.io/pkgs/free/
conda config --add channels https://repo.continuum.io/pkgs/main/
conda config --set show_channel_urls yes