恢复默认源：
conda config --remove-key channels
换源：
(清华源)
conda config --add channels /anaconda/pkgs/free/
conda config --add channels /anaconda/cloud/conda-forge
conda config --add channels /anaconda/cloud/msys2/
conda config --set show_channel_urls yes(中科大源)
conda config --add channels /anaconda/pkgs/main/
conda config --add channels /anaconda/pkgs/free/
conda config --add channels /anaconda/cloud/conda-forge/
conda config --add channels /anaconda/cloud/msys2/
conda config --add channels /anaconda/cloud/bioconda/
conda config --add channels /anaconda/cloud/menpo/
conda config --set show_channel_urls yes