Edit, August 2013: my current favorite way to set up a python installation on mac (and any other system) is to use the anaconda package offered by Continuum Analytics. It's free, full-featured, and extremely easy to use.
A few weeks ago, after years of using Linux exclusively for all my computing, I started a research fellowship in a new department and found a brand new Macbook Pro on my desk. Naturally, my first instinct was to set up the system for efficient Python development. In order to help others who might find themself in a similar situation, I took some notes on the process, and I'll summarize what I learned below.
First, a disclaimer: I can't promise that these suggestions are the best or most effective way to proceed. I'm by no stretch of the imagination a Mac expert: the last Apple product I used regularly was the trusty Macintosh Classic my parents bought when I was in middle school. I primarily used it for all-day marathons of RoboSport and Civilization, with occasional breaks to teach myself programming in Hypercard. But I digress.
Before moving on to the summary of what I learned, I should note that all of the following was done on OSX 10.8: there will likely be differences between OSX versions. I've done my best to note all the relevant details, and I hope you will find this helpful!
Accessing the Terminal
Being from a Linux background, I was interested in setting up a Linux-like work environment, doing nearly everything from the terminal. Fortunately, OSX is built on unix, with a terminal integrated into the operating system.
To open a terminal, open the finder, click "Applications" and search for "Terminal". To make it easier to access in the future, I dragged the icon down to the dock, the collection of icons usually found on the bottom or side of the screen. Clicking the icon will open a familiar bash terminal that can be used to explore your Mac in a more user-friendly way.
Setting Up MacPorts
To set up the rest of the system components, I opted to use MacPorts, which is
a package management system similar to
yum on ubuntu and
debian systems. There are probably alternatives to MacPorts, but I found
it very intuitive, quick, and powerful.
You can download MacPorts for free on the MacPorts website. You'll have to install it for the correct OSX version -- to check which OSX version you're running, click "about this computer" under the apple icon at the top-left of the desktop. Unfortunately, I was following the slightly outdated MacPorts guide and got a few errors:
Error: No Xcode installation was found. Error: Please install Xcode and/or run xcode-select to specify its location. Error: Warning: xcodebuild exists but failed to execute Warning: Xcode does not appear to be installed; most ports will likely fail to build.
This indicates that Xcode is not yet installed. Xcode is a a collection of developer tools for the Mac, and it can be freely downloaded at the Apple App store. You'll need to create an Apple account to access it, and then make sure you have a fast internet connection: the download is about 1.6GB. Once it's downloaded, find the XCode icon in the Applications menu and click to install.
With this done, I tried installing MacPorts again, but still got an error:
Error: Unable to open port: can't read "build.cmd": Failed to locate 'make' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?
This indicates that the command-line tools are not installed by default. To fix this, run Xcode, select Xcode->preferences from the menu bar, click downloads, select "command-line tools", and click install. You'll also need Xorg tools, which I installed through XQuartz.
Now that MacPorts is installed, it's very straightforward to install several
versions of Python and other programs. MacPorts allows access to a standard
repository of programs and packages, which can be explored, downloaded, and
installed using the
First of all, run
sudo port selfupdate
which updates the MacPorts base to the latest release. Another useful
thing to know about is the MacPorts
search command. For example, to
see all the available packages which mention "python", use
port search python
This will list all the python versions available. I installed both Python 2.7 and Python 3.3
sudo port install python27 sudo port install python33
If you want
python on the command-line to point to a particular version,
this can be specified with the
sudo port select --set python python27
You can now check that typing
python --version in the terminal returns
Installing Numpy, Scipy, etc.
My scientific development in Python relies on several packages:
Here is the series of commands to set these up for Python 2.7:
sudo port install py27-numpy sudo port install py27-scipy sudo port install py27-matplotlib sudo port install py27-tornado sudo port install py27-zmq # zmq & tornado needed for notebook/parallel sudo port install py27-ipython sudo port select --set ipython ipython27 sudo port install py27-cython sudo port select --set python cython27 sudo port install py27-scikits-learn sudo port install py27-virtualenv sudo port install virtualenv_select sudo port select --set virtualenv virtualenv27 sudo port install py27-nose-testconfig sudo port select --set nosetests nosetests27 sudo port install py27-pep8 sudo port install pep8_select sudo port select --set pep8 pep827 sudo port install py27-pip
Unfortunately, there seems to not yet be a
port select command
for pip. This bug has been reported and is noted
Setting up a Virtual Environment
For Python development, I find it vital to make a good use of virtual environments. Virtual environments, enabled by the virtualenv package, allow you to install several different versions of various python packages, such that the installations are mostly independent. I generally keep stable released versions of packages in the system-wide python install, and use these environments to develop the packages. That way, I can test the compilation/installation of a new feature in scipy or scikit-learn without breaking my tried-and-true system installation.
Here we'll set up a virtual environment called
PyEnv subdirectory, and
numpy in that environment using
mkdir ~/PyEnv cd ~/PyEnv virtualenv default source default/bin/activate pip install numpy
Other Programs to Install
There are several other things I found helpful to install. First, the
Fortran compiler for building scipy and other packages which require fortran:
sudo port install g95
Also, we'll install and configure the tool every open source developer needs:
sudo port install git git config --global user.name "John Doe" git config --global user.email firstname.lastname@example.org
Another essential is a good text editor. There are several good open source options for this.
Textmate is a Mac native text editor which has many nice features, works nicely on mac, and is fairly clean and nice to use:
sudo port install textmate2 mate tmp.txt
Vim is another popular text editor: there is both a command-line version and a GUI version available:
sudo port install vim sudo port install MacVim vim tmp.txt
Emacs is my text editor of choice, and like Vim there is both a command-line version and a GUI version:
sudo port install emacs sudo port install emacs-app emacs tmp.txt
There are several other GUI emacs versions available as well (e.g.
emacs-mac-app): I found that I liked
best. Unfortunately, it lives in the "Applications" folder, and there
doesn't seem to be a way to configure the emacs GUI to work the same way
as the default emacs behavior on linux (see the related discussion thread
I ended up putting the emacs GUI in the dock next to the terminal, and I
access it from there.
I've had this setup on my new Macbook for about two weeks now, and it seems to be working well for my daily python programming tasks. I hope that this post will be useful to someone out there. I'm still learning as well -- if you have any pro tips for me or for other readers, feel free to leave them in the comments below!