常用命令：
zhong@slave2:~$ conda --version
conda 4.3.30
zhong@slave2:~$ conda list
zhong@slave2:~$ conda info -e
# conda environments:
#
Densepose /home/bdc/anaconda3/envs/Densepose
py27 /home/bdc/anaconda3/envs/py27
root * /home/bdc/anaconda3
source activate py27
source deactivate