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# Overview

This document describes the steps required to install IPython. IPython is organized into a number of subpackages, each of which has its own dependencies. All of the subpackages come with IPython, so you don’t need to download and install them separately. However, to use a given subpackage, you will need to install all of its dependencies.

Please let us know if you have problems installing IPython or any of its dependencies. Officially, IPython requires Python 2.6, 2.7, 3.1, or 3.2.

Warning

Since version 0.11, IPython has a hard syntax dependency on 2.6, and will no longer work on Python <= 2.5. You can find older versions of IPython which supported Python <= 2.5 here

Some of the installation approaches use the `distribute` package and its easy_install command line program. In many scenarios, this provides the most simple method of installing IPython and its dependencies. More information about `distribute` can be found on its PyPI page.

Note

On Windows, IPython has a hard dependency on `distribute`. We hope to change this in the future, but for now on Windows, you must install `distribute`.

More general information about installing Python packages can be found in Python’s documentation.

# Quickstart

If you have `distribute` installed and you are on OS X or Linux (not Windows), the following will download and install IPython and the main optional dependencies:

    $ easy_install ipython[zmq,qtconsole,notebook,test]

This will get:

- pyzmq, needed for IPython’s parallel computing features, qt console and notebook.
- pygments, used by the Qt console for syntax highlighting.
- tornado, needed by the web-based notebook
- nose, used by the test suite.

To run IPython’s test suite, use the iptest command:

    $ iptest

# Installing IPython itself

Given a properly built Python, the basic interactive IPython shell will work with no external dependencies. However, some Python distributions (particularly on Windows and OS X), don’t come with a working `readline` module. The IPython shell will work without `readline`, but will lack many features that users depend on, such as tab completion and command line editing. If you install IPython with `distribute`, (e.g. with easy_install), then the appropriate `readline` for your platform will be installed. See below for details of how to make sure you have a working `readline`.

## Installation using easy_install

If you have `distribute` installed, the easiest way of getting IPython is to simply use easy_install:

    $ easy_install ipython

That’s it.

## Installation from source

If you don’t want to use easy_install, or don’t have it installed, just grab the latest stable build of IPython from here. Then do the following:

    $ tar -xzf ipython.tar.gz
    $ cd ipython
    $ python setup.py install

If you are installing to a location (like `/usr/local`) that requires higher permissions, you may need to run the last command with sudo.

## Windows

As mentioned above, on Windows, IPython requires `distribute`, and it also requires the PyReadline library to properly support coloring and keyboard management (features that the default windows console doesn’t have). So on Windows, the installation procedure is:

1. Install distribute.
2. Install pyreadline. You can use the command `easy_install pyreadline` from a terminal, or the binary installer appropriate for your platform from the PyPI page.
3. Install IPython itself, which you can download from PyPI or from our site. Note that on Windows 7, you must right-click and ‘Run as administrator’ for the Start menu shortcuts to be created.

IPython by default runs in a terminal window, but the normal terminal application supplied by Microsoft Windows is very primitive. You may want to download the excellent and free Console application instead, which is a far superior tool. You can even configure Console to give you by default an IPython tab, which is very convenient to create new IPython sessions directly from the working terminal.

## Installing the development version

It is also possible to install the development version of IPython from our Git source code repository. To do this you will need to have Git installed on your system. Then just do:

    $ git clone https://github.com/ipython/ipython.git
    $ cd ipython
    $ python setup.py install

Some users want to be able to follow the development branch as it changes. If you have `distribute` installed, this is easy. Simply replace the last step by:

    $ python setupegg.py develop

This creates links in the right places and installs the command line script to the appropriate places. Then, if you want to update your IPython at any time, just do:

    $ git pull

# Basic optional dependencies

There are a number of basic optional dependencies that most users will want to get. These are:

- readline (for command line editing, tab completion, etc.)
- nose (to run the IPython test suite)
- pexpect (to use things like irunner)

If you are comfortable installing these things yourself, have at it, otherwise read on for more details.

## readline

As indicated above, on Windows, PyReadline is a mandatory dependency. PyReadline is a separate, Windows only implementation of readline that uses native Windows calls through `ctypes`. The easiest way of installing PyReadline is you use the binary installer available here.

On OSX, if you are using the built-in Python shipped by Apple, you will be missing a full readline implementation as Apple ships instead a library called `libedit` that provides only some of readline’s functionality. While you may find libedit sufficient, we have occasional reports of bugs with it and several developers who use OS X as their main environment consider libedit unacceptable for productive, regular use with IPython.

Therefore, we strongly recommend that on OS X you get the full `readline` module. We will not consider completion/history problems to be bugs for IPython if you are using libedit.

To get a working `readline` module, just do (with `distribute` installed):

    $ easy_install readline

Note

Other Python distributions on OS X (such as fink, MacPorts and the official python.org binaries) already have readline installed so you likely don’t have to do this step.

When IPython is installed with `distribute`, (e.g. using the `easy_install` command), readline is added as a dependency on OS X, and PyReadline on Windows, and will be installed on your system. However, if you do not use distribute, you may have to install one of these packages yourself.

## nose

To run the IPython test suite you will need the `nose` package. Nose provides a great way of sniffing out and running all of the IPython tests. The simplest way of getting nose, is to use easy_install:

    $ easy_install nose

Another way of getting this is to do:

    $ easy_install ipython[test]

For more installation options, see the nose website.

Once you have nose installed, you can run IPython’s test suite using the iptest command:

    $ iptest

## pexpect

The pexpect package is used in IPython’s irunner script, as well as for managing subprocesses. IPython now includes a version of pexpect in `IPython.external`, but if you have installed pexpect, IPython will use that instead. On Unix platforms (including OS X), just do:

    $ easy_install pexpect

Windows users are out of luck as pexpect does not run there.

# Dependencies for IPython.parallel (parallel computing)

`IPython.kernel` has been replaced by `IPython.parallel`, which uses ZeroMQ for all communication.

IPython.parallel provides a nice architecture for parallel computing, with a focus on fluid interactive workflows. These features require just one package: PyZMQ. See the next section for PyZMQ details.

On a Unix style platform (including OS X), if you want to use `distribute`, you can just do:

    $ easy_install ipython[zmq]    # will include pyzmq

Security in IPython.parallel is provided by SSH tunnels. By default, Linux and OSX clients will use the shell ssh command, but on Windows, we also support tunneling with paramiko.

# Dependencies for IPython.zmq

## pyzmq

IPython 0.11 introduced some new functionality, including a two-process execution model using ZeroMQ for communication. The Python bindings to ZeroMQ are found in the PyZMQ project, which is easy_install-able once you have ZeroMQ installed. If you are on Python 2.6 or 2.7 on OSX, or 2.7 on Windows, pyzmq has eggs that include ZeroMQ itself.

IPython.zmq depends on pyzmq >= 2.1.4.

# Dependencies for the IPython QT console

## pyzmq

Like the `IPython.parallel` package, the QT Console requires ZeroMQ and PyZMQ.

## Qt

Also with 0.11, a new GUI was added using the work in `IPython.zmq`, which can be launched with `ipython qtconsole`. The GUI is built on Qt, and works with either PyQt, which can be installed from the PyQt website, or PySide, from Nokia.

## pygments

The syntax-highlighting in `ipython qtconsole` is done with the pygments project, which is easy_install-able.

# Dependencies for the IPython HTML notebook

The IPython notebook is a notebook-style web interface to IPython and can be started withe command `ipython notebook`.

## pyzmq

Like the `IPython.parallel` and `IPython.frontend.qt.console` packages, the HTML notebook requires ZeroMQ and PyZMQ.

## Tornado

The IPython notebook uses the Tornado project for its HTTP server. Tornado 2.1 is required, in order to support current versions of browsers, due to an update to the websocket protocol.

## MathJax

The IPython notebook uses the MathJax Javascript library for rendering LaTeX in web browsers. Because MathJax is large, we don’t include it with IPython. Normally IPython will load MathJax from a CDN, but if you have a slow network connection, or want to use LaTeX without an internet connection at all, we do include a utility to aid in downloading MathJax and installing it into the proper location:

    from IPython.external.mathjax import install_mathjax
    install_mathjax()

This function does require write access to the IPython install directory, so if you have a system-wide Python install, it may need to be done from a `sudo python` session.

## Browser Compatibility

The notebook uses WebSockets and the flexible box model. These features are available in the following browsers:

- Chrome
- Safari
- Firefox 6 and above
- Firefox 4 and 5: These browsers have WebSocket support, but it is disabled by default. If you’re unable to upgrade, you can enable it by entering `about:config` in the URL bar and then setting `network.websocket.enabled` and `network.websocket.override-security-block` to `true`.

Internet Explorer 9 does not support WebSockets or the flexible box model, but these features should appear in Internet Explorer 10.

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