Version Management Tools

If you’re working on multiple software projects, it is a good practice to use Version Management Tools to maintain consistency amongst and between different code bases.

In Ruby, for example, many developers manage their Ruby versions using using tools like rbenv and RVM.

I wanted to do a similar setup using Python and ended up settling on pyenv. Using pyenv, I was able to download specific versions of Python 2/3 and set both to be available globally.

Node has a similar tool, called nvm which has much of the same functionality as it’s counterparts.

Java, not to be outdone, has a tool called jenv.

If you had previously installed Python / Ruby / Node, you will need to remove the existing installations (excluding System installations, e.g. Python) and/or set the managed versions before the user-installed versions in your $PATH .

jenv does not install JDKs


Install and configure pyenv

$ brew install pyenv
$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc
$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc
$ echo 'if which pyenv > /dev/null; then eval "$(pyenv init -)"; fi' >> ~/.bashrc
Install Python versions
$ env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install 2.7.13
$ env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install 3.4.5
Set pyenv versions
# Python 2
$ pyenv global 2.7.13
$ pip install -U pip virtualenv virtualenvwrapper

# Python 3
$ pyenv global 3.4.5
$ pip3 install -U pip virtualenv virtualenvwrapper

# Set Python 2/3 available globally
$ pyenv global 2.7.13 3.4.5

Install pyenv-virtualenv and pyenv-virtualenvwrapper as plugins

$ git clone ~/.pyenv/plugins/pyenv-virtualenv
$ git clone ~/.pyenv/plugins/pyenv-virtualenvwrapper
Test pyenv installations
$ pyenv versions
$ pyenv whence virtualenv
$ pyenv virtualenvs


Install and configure rbenv

$ brew install rbenv
$ echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bashrc
$ echo 'test -d "$HOME/.rbenv/" && PATH="$HOME/.rbenv/bin:$PATH" && PATH="$HOME/.rbenv/shims:$PATH"' >> ~/.bashrc
Install Ruby versions
$ rbenv install 2.3.1
$ rbenv install 2.2.5
Set rbenv versions
$ rbenv global 2.3.1
Test rbenv installations
$ rbenv versions


Install and configure nvm

$ curl -o- | bash
Use system version for administering nvm
$ nvm use system
Set LTS version as default
$ nvm alias default lts/*
Install Node versions
$ nvm install --lts
Test nvm installations
$ nvm ls


Install and configure jenv

$ brew install jenv
$ echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bashrc
$ echo 'if which jenv > /dev/null; then eval "$(jenv init -)"; fi' >> ~/.bashrc
Add Java versions to jenv
$ jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home/
$ jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/
Test jenv installations
$ jenv versions

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