想更新下spyder，然后conda update anaconda就一直在solving environment那里不动了

solution：

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/

conda config --set show_channel_urls yes

conda update anaconda
conda install spyder=5.2.2