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The last line initializes pyenv each time you open a terminal.

The second line puts pyenv first in your search path so that the OS will find pyenv’s Python(s) before any other Pythons.

The first line sets an environment variable ( PYENV_ROOT) that points to the pyenv directory.

These commands will add lines three lines to your configuration. If you’re using zsh, your profile consists of ~/.zprofile and ~/.zshrc. $ typically means bash and % typically means zsh.) If you’re using bash, your profile configuration is located at ~/.bash_profile. (Also, the last character in your shell prompt is a clue as well.

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The middle of the text, to the left of the windows dimensions, displays which shell you’re using. An easy way to find out is the title bar of your macOS Terminal window. Where your shell profile is located depends on which shell you are using.

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In order for pyenv to work, you need to update your shell/terminal profile configuration. If you already have the latest version, it will give you a warning like this one: Warning: pyenv 1.2.16 already installed Step 3: Enable pyenv in your profile

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Using Homebrew, installing pyenv is easy: $ brew update $ brew install pyenvĪfter installing pyenv, you can upgrade to newer versions whenever you want using Homebrew. (If you prefer not to use Homebrew, there are other install options available on the pyenv main repository.) Step 2: Install pyenv binary Otherwise, run this command in a MacOS terminal to install Homebrew on your Mac: $ /bin/bash -c "$(curl -fsSL )" If you already use Homebrew, skip to Step 2. On a Mac, I recommend using Homebrew to install pyenv.

The pyenv installation tasks don’t have to be repeated for each new Python version you install. pyenv is the Python manager, or, as I prefer to think of it, the Python cat herder. Pyenv does not come with any Python versions but will help you install them in an organized way. The next section goes into installing Python versions. This section describes installing the pyenv binary itself. Installing pyenv and Python versions are two separate tasks. = 3 passed in 0.37s = Part 2: Installing pyenv = 3 passed in 0.20 seconds = $ pyenv local 3.8.1 $ pytest = test session starts = platform darwin - Python 3.8.1, pytest-5.3.5, py-1.8.1, pluggy-0.13.1 rootdir: /Users/usario/proj/compatibleversion, inifile: setup.cfg collected 3 items tests/test_compatibleversion.py. $ pytest = test session starts = platform darwin - Python 2.7.17, pytest-4.6.9, py-1.8.1, pluggy-0.13.1 rootdir: /Users/usario/proj/compatibleversion, inifile: setup.cfg collected 3 items tests/test_compatibleversion.py. For example, you can run unit tests using pytest against Python 2.7, switch to Python 3.8, and run the tests again - all with three easy commands. This makes running tests against different Python versions easy. $ pyenv local 2.7.17 $ python -version Python 2.7.17 $ pyenv local 3.5.9 $ python -version Python 3.5.9 With a simple command and without reinstalling anything, you can also switch which version of Python you’re using. $ python -version Python 3.6.10 $ python3.5 -version Python 3.5.9 $ python3.7 -version Python 3.7.6 $ python3.8 -version Python 3.8.1 $ python2.7 -version Python 2.7.17 Switch Python versions on command With pyenv, you can set a default version but easily refer to all five versions. pyenv makes it easy to use several versions.įor example, assume your project needs to run on five versions, Python 2.7, 3.5, 3.6, 3.7, and 3.8. While having a single Python version per project is a nice idea, it is probably more realistic that a single project will need to run on multiple Python versions. project2 project2$ python -version Python 3.8.1īoom! Use multiple Python versions at the same time $ cd project1 project1$ python -version Python 2.7.17 project1$ cd.

Simply change directories and the version of Python magically changes! If you have one project that uses Python 2.7.17 and another that’s on Python 3.8.1, switching directories between the projects automatically change your Python version too. This is one of pyenv’s coolest party pieces.

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For a complete guide, see my story Zero to Hero: Set Up Your Mac for Software Development.īefore we get into the how of pyenv, what can you do with it? Switch Python versions by changing directories If your needs are simpler, see my story on The Right Way to Set Up Python on Your Mac.

NOTE: This article discusses an advanced way to use Python where you need multiple versions.