Initialize Anaconda

1. List environments ---------------

$ conda env list

1. Create environment with preinstalled packages ---------------

$ conda create -n my_env numpy  #create my_env, install numpy
$ conda create -n py2 python=2  #create py2, install python ver.=2
$ conda create -n py3 python=3  #create py3, install python ver.=3
$ conda env list 
base               *    /Users/RAYMOND/anaconda3
my_env                  /Users/RAYMOND/anaconda3/envs/my_env
py2                     /Users/RAYMOND/anaconda3/envs/py2
py3                     /Users/RAYMOND/anaconda3/envs/py3
                       /Users/RAYMOND/miniconda3       
 
# Enter environment ---------------
# * indicates which environment we are using
$ source activate py2
(py2) $ conda env list
base                    /Users/RAYMOND/anaconda3
my_env                  /Users/RAYMOND/anaconda3/envs/my_env
py2                *    /Users/RAYMOND/anaconda3/envs/py2
py3                     /Users/RAYMOND/anaconda3/envs/py3
                       /Users/RAYMOND/miniconda3
(py2) $ python
Python 2.7.14 |Anaconda, Inc.| (default, Mar 27 2018, 12:28:59)
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

1. Exit environment ---------------

(py2) $ source deactivate

1. Delete environment ---------------

$ conda env remove -n my_env
$ conda env remove -n py2
$ conda env remove -n py3
$ conda env list
base               *    /Users/RAYMOND/anaconda3
/Users/RAYMOND/miniconda3