conda create --name python27 python=2.7 #创建python2.7
source activate python27 #激活Python2.7
source deactivate python27 #取消激活Python2.7
conda create --name python27 python=2.7 #创建python2.7
source activate python27 #激活Python2.7
source deactivate python27 #取消激活Python2.7