Build a python environment for Mac OSX

build_python_environment.md

1: Install pyenv

• Install pyenv via github and set your *shrc

$ git clone https://github.com/yyuu/pyenv.git ~/.pyenv
$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc
$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc
$ echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.zshrc
$ source ~/.zshrc
# OR $ exec "$SHELL"

• Then, you can use pyenv command.

$ pyenv -v
  pyenv 1.1.3-7-g0c909f7

2: Install anaconda

• Confirm latest anaconda version.

$ pyenv install -l | grep ana
  anaconda-1.4.0
(-- snip --)
  anaconda3-4.3.0
  anaconda3-4.3.1
  anaconda3-4.4.0

• Install latest anaconda by using pyenv.

$ pyenv install anaconda3-4.4.0
Downloading Anaconda3-4.4.0-MacOSX-x86_64.sh...
-> https://repo.continuum.io/archive/Anaconda3-4.4.0-MacOSX-x86_64.sh
Installing Anaconda3-4.4.0-MacOSX-x86_64...
Installed Anaconda3-4.4.0-MacOSX-x86_64 to /Users/momota/.pyenv/versions/anaconda3-4.4.0

$ pyenv rehash
$ pyenv global anaconda3-4.4.0

• Confirm python environment.

$ pyenv versions
  system
* anaconda3-4.4.0 (set by /Users/momota/.pyenv/version)

3: Create local environment

• Make a working directory as you like.

$ mkdir -p ~/directory-which-you-like
$ cd $_

• Create virtual environment by using anaconda

$ pyenv local anaconda3-4.4.0
$ pyenv rehash

$ conda create -n py3.6 python=3.6 anaconda
-- (snip) --
# To activate this environment, use:
# > source activate py3.6
#
# To deactivate this environment, use:
# > source deactivate py3.6

• Set up local environment using the previous virtual environment.

$ pyenv local anaconda3-4.4.0/envs/py3.6
$ cat .python-version
anaconda3-4.4.0/envs/py3.6

• Activate your virtual environment.

$ source $PYENV_ROOT/versions/anaconda3-4.4.0/bin/activate py3.6

# If you want to deactive this environment, execute as below
$ source $PYENV_ROOT/versions/anaconda3-4.4.0/bin/deactivate