IPython3 for Mac OSX
ipython, macos, python-2.7, python-3.x
Solution
You need to install `pip` for Python 3 - it's as easy as going to the `pip-installer.org` Installation page and following the instructions. Briefly, download `get-pip.py` and save it someplace, like your `Downloads` folder. Navigate there in Terminal, and run
sudo python3 get-pip.py
and you should soon have either a `pip3` or `pip-3.3` command (maybe both, I don't remember). You should now be able to run
sudo pip3 install ipython[all]
and hopefully all the dependencies will be installed as well. If installation chokes, use `pip3` to install `pyzmq`, `tornado`, `pyreadline`, `jinja2`, `pygments`, and maybe a few others. Make sure you read the docs before you start, so you have an idea of what you're trying to achieve. IPython is large and quite complex, with many moving parts, so in the absence of a package manager (see below) it can take a bit of time before everything is up and running.
The Package Manager Way
There are other options, too. You can install Anaconda, a "Completely free enterprise-ready Python distribution for large-scale data processing, predictive analytics, and scientific computing" with over 100 packages, including IPython and its dependencies. By default, the Anaconda installer gives you Python 2.7, but you can use the `conda` command to install Python 3.
My personal favorite is to install Python 3 and IPython using MacPorts. Yes, it'll install Py3 all over again, but unless you're really starving for disk space (in which case you probably don't want to be installing large packages like IPython) it's no big deal. Using the `port` command, once the base MacPorts installation has been put in place, you can just run
sudo port install py33-ipython +pyqt4
and all the other dependencies will be taken care of, (hopefully) flawlessly, without your having to do anything else except wait for a long time while things like PyQt are compiled. You may also need to run `sudo port install py33-ipython +notebook` if you want the notebook, I don't recall if it's installed otherwise. BTW, you do need X11, Xcode, and the Xcode command-line tools for MacPorts, but they would likely be required if you do the first option as not all packages have binaries available for OS X. The excellent documentation walks you through everything, from installation to using the `port` command to maintaining your system. I would highly recommend modifying your `~/.profile` (or `~/.bash_profile`, `~/.bashrc`, or equivalent for your shell) to add the MacPorts install directories (`/opt/local/bin` and `/opt/local/sbin`, by default) to the front of your path. Just add `export PATH='/opt/local/bin:/opt/local/sbin:$PATH'` to the end of the file.
A third alternative option is to use Homebrew. It's similar to MacPorts, in that the `brew` command is a type of package manager like `port` and `conda`, but in my experience it doesn't have as many packages, and doesn't quite work as seamlessly as `port`. However, my observations on StackOverflow, Ask Different and other fora seem to indicate that about 50% of people have great experiences with `brew` and don't like `port`, while the other half loves `port` over `brew`. YMMV.
I hope this helps. Good luck with your installation!
Problem
I have Ipython installed but it runs on python 2.7.5 , I also have python 3.3 installed. How can I make changes such that Ipython runs on python 3.3 not 2.7.5?