Anaconda升级之后无法使用旧环境-马春杰杰

今天把Anaconda升级了下，然后再用之前的环境就不行了：

$ source activate py3

EnvironmentNameNotFound: Could not find conda environment: py3
You can list all discoverable environments with `conda info --envs`.

$ source activate py3

EnvironmentNameNotFound: Could not find conda environment: py3

You can list all discoverable environments with `conda info --envs`.

查看系统环境：

$ conda env list
# conda environments:
#
                         /Users/mcj/anaconda3
                         /Users/mcj/anaconda3/envs/py3
                         /Users/mcj/anaconda3/envs/pytorch
                         /Users/mcj/anaconda3/envs/tf
                         /Users/mcj/anaconda3/envs/xjj
base                  *  /opt/anaconda3

$ conda env list

# conda environments:

/Users/mcj/anaconda3

/Users/mcj/anaconda3/envs/py3

/Users/mcj/anaconda3/envs/pytorch

/Users/mcj/anaconda3/envs/tf

/Users/mcj/anaconda3/envs/xjj

base * /opt/anaconda3

原来是新的Anaconda更换了安装路径，导致旧的包名字无法识别，如果临时要用一下旧的包，可以直接：

conda activate /Users/mcj/anaconda3/envs/py3

1	conda activate /Users/mcj/anaconda3/envs/py3

如果想恢复旧环境名，可以添加一下路径：

conda config --append envs_dirs /Users/mcj/anaconda3/envs

1	conda config --append envs_dirs /Users/mcj/anaconda3/envs

这样就正常了：

$ conda env list                                           
# conda environments:
#
                         /Users/mcj/anaconda3
py3                   *  /Users/mcj/anaconda3/envs/py3
pytorch                  /Users/mcj/anaconda3/envs/pytorch
tf                       /Users/mcj/anaconda3/envs/tf
xjj                      /Users/mcj/anaconda3/envs/xjj
base                     /opt/anaconda3