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Adam Nelson
117 lines
3.8 KiB
ReStructuredText
117 lines
3.8 KiB
ReStructuredText
.. _install3-osx:
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Installing Python 3 on Mac OS X
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================================
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The latest version of Mac OS X, El Capitan, **comes with Python 2.7 out of the box**.
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You do not need to install or configure anything else to use Python 2. These
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instructions document the installation of Python 3.
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The version of Python that ships with OS X is great for learning but it's not
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good for development. The version shipped with OS X may be out of date from the
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`official current Python release <https://www.python.org/downloads/mac-osx/>`_,
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which is considered the stable production version.
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Doing it Right
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--------------
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Let's install a real version of Python.
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Before installing Python, you'll need to install GCC. GCC can be obtained
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by downloading `XCode <http://developer.apple.com/xcode/>`_, the smaller
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`Command Line Tools <https://developer.apple.com/downloads/>`_ (must have an
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Apple account) or the even smaller `OSX-GCC-Installer <https://github.com/kennethreitz/osx-gcc-installer#readme>`_
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package.
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.. note::
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If you already have XCode installed, do not install OSX-GCC-Installer.
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In combination, the software can cause issues that are difficult to
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diagnose.
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.. note::
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If you perform a fresh install of XCode, you will also need to add the
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commandline tools by running ``xcode-select --install`` on the terminal.
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While OS X comes with a large number of UNIX utilities, those familiar with
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Linux systems will notice one key component missing: a package manager.
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`Homebrew <http://brew.sh>`_ fills this void.
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To `install Homebrew <http://brew.sh/#install>`_, open :file:`Terminal` or
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your favorite OSX terminal emulator and run
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.. code-block:: console
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$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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The script will explain what changes it will make and prompt you before the
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installation begins.
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Once you've installed Homebrew, insert the Homebrew directory at the top
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of your :envvar:`PATH` environment variable. You can do this by adding the following
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line at the bottom of your :file:`~/.profile` file
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.. code-block:: console
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export PATH=/usr/local/bin:/usr/local/sbin:$PATH
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Now, we can install Python 3:
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.. code-block:: console
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$ brew install python3
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This will take a minute or two.
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Pip
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----------------
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Homebrew installs ``pip3`` for you.
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``pip3`` is the alias for the Python 3 version of ``pip`` on systems with both
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the Homebrew'd Python 2 and 3 installed.
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Working with Python3
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--------------------
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At this point, you have the system Python 2.7 available, potentially the
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:ref:`Homebrew version of Python 2 <install-osx>` installed, and the Homebrew
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version of Python 3 as well.
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.. code-block:: console
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$ python
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will launch the Python 2 interpreter.
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.. code-block:: console
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$ python3
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will launch the Python 3 interpreter
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``pip3`` and ``pip`` will both be available. If the Homebrew version of Python
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2 is not installed, they will be the same. If the Homebrew version of Python 2
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is installed then ``pip`` will point to Python 2 and ``pip3`` will point to
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Python 3.
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Virtual Environments
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--------------------
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A Virtual Environment (commonly referred to as a 'virtualenv') is a tool to keep
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the dependencies required by different projects in separate places, by creating
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virtual Python environments for them. It solves the "Project X depends on
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version 1.x but, Project Y needs 4.x" dilemma, and keeps your global
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site-packages directory clean and manageable.
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For example, you can work on a project which requires Django 1.10 while also
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maintaining a project which requires Django 1.8.
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To start using this and see more information: :ref:`Virtual Environments <virtualenvironments-ref>` docs.
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--------------------------------
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This page is a remixed version of `another guide <http://www.stuartellis.eu/articles/python-development-windows/>`_,
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which is available under the same license.
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