This documentation covers IPython versions 6.0 and higher. Beginning with version 6.0, IPython stopped supporting compatibility with Python versions lower than 3.3 including all versions of Python 2.7.

If you are looking for an IPython version compatible with Python 2.7, please use the IPython 5.x LTS release and refer to its documentation (LTS is the long term support release).

6.x Series

IPython 6.0

Released April 19th, 2017

IPython 6 feature a major improvement in the completion machinery which is now capable of completing non-executed code. It is also the first version of IPython to stop compatibility with Python 2, which is still supported on the bugfix only 5.x branch. Read below to have a non-exhaustive list of new features.

Make sure you have pip > 9.0 before upgrading. You should be able to update by using:

pip install ipython --upgrade


If your pip version is greater of equal to pip 9.0.1 you will automatically get the most recent version of IPython compatible with your system: on Python 2 you will get the latest IPython 5.x bugfix, while in Python 3 you will get the latest 6.x stable version.

New completion API and Interface

The completer Completion API has seen an overhaul, and the new completer have plenty of improvement both from the end users of terminal IPython or for consumers of the API.

This new API is capable of pulling completions from jedi, thus allowing type inference on non-executed code. If jedi is installed completion like the following are now becoming possible without code evaluation:

>>> data = ['Number of users', 123_456]
... data[0].<tab>

That is to say, IPython is now capable of inferring that data[0] is a string, and will suggest completions like .capitalize. The completion power of IPython will increase with new Jedi releases, and a number of bugs and more completions are already available on the development version of jedi if you are curious.

With the help of prompt toolkit, types of completions can be shown in the completer interface:

Jedi showing ability to do type inference

The appearance of the completer is controlled by the c.TerminalInteractiveShell.display_completions option that will show the type differently depending on the value among 'column', 'multicolumn' and 'readlinelike'

The use of Jedi also fulfills a number of requests and fix a number of bugs like case-insensitive completion, completion after division operator: See PR #10182.

Extra patches and updates will be needed to the ipykernel package for this feature to be available to other clients like Jupyter Notebook, Lab, Nteract, Hydrogen...

The use of Jedi is should be barely noticeable on recent enough machines, but can be slower on older ones. To tweak the performances, the amount of time given to Jedi to compute type inference can be adjusted with c.IPCompleter.jedi_compute_type_timeout. The objects whose type were not inferred will be shown as <unknown>. Jedi can also be completely deactivated by using the c.Completer.use_jedi=False option.

The old Completer.complete() API is waiting deprecation and should be replaced replaced by Completer.completions() in a near future. Feedback on the current state of the API and suggestions welcome.

Python 3 only codebase

One of the large challenges in IPython 6.0 has been the adoption of a pure Python 3 codebase, which leads us to great length to upstream patches in pip, pypi and warehouse to make sure Python 2 system still upgrade to the latest compatible Python version compatible.

We remind our Python 2 users that IPython 5 is still compatible with Python 2.7, still maintained and get regular releases. Using pip 9+, upgrading IPython will automatically upgrade to the latest version compatible with your system.


If you are on a system using an older version of pip on Python 2, pip may still install IPython 6.0 on your system, and IPython will refuse to start. You can fix this by upgrading pip, and reinstalling ipython, or forcing pip to install an earlier version: pip install 'ipython<6'

The ability to use only Python 3 on the code base of IPython brings a number of advantage. Most of the newly written code make use of optional function type annotation leading to clearer code and better documentation.

The total size of the repository has also decreased by about 1500 lines (for the first time excluding the big split for 4.0). The decrease is potentially a bit more for the sour as some documents like this one are append only and are about 300 lines long.

The removal as of Python2/Python3 shim layer has made the code quite clearer and more idiomatic in a number of location, and much friendlier to work with and understand. We hope to further embrace Python 3 capability in the next release cycle and introduce more of the Python 3 only idioms (yield from, kwarg only, general unpacking) in the code base of IPython, and see if we can take advantage of these as well to improve user experience with better error messages and hints.

Configurable TerminalInteractiveShell, readline interface

IPython gained a new c.TerminalIPythonApp.interactive_shell_class option that allows customizing the class used to start the terminal frontend. This should allow a user to use custom interfaces, like reviving the former readline interface which is now a separate package not actively maintained by the core team. See the project to bring back the readline interface: rlipython.

This change will be backported to the IPython 5.x series.

Miscs improvements

  • The %%capture magic can now capture the result of a cell (from an expression on the last line), as well as printed and displayed output. PR #9851.
  • Pressing Ctrl-Z in the terminal debugger now suspends IPython, as it already does in the main terminal prompt.
  • Autoreload can now reload Enum. See #10232 and PR #10316
  • IPython.display has gained a GeoJSON object. PR #10288 and PR #10253

Functions Deprecated in 6.x Development cycle

  • Loading extensions from ipython_extension_dir prints a warning that this location is pending deprecation. This should only affect users still having extensions installed with %install_ext which has been deprecated since IPython 4.0, and removed in 5.0. Extensions still present in ipython_extension_dir may shadow more recently installed versions using pip. It is thus recommended to clean ipython_extension_dir of any extension now available as a package.
  • IPython.utils.warn was deprecated in IPython 4.0, and has now been removed. instead of IPython.utils.warn inbuilt warnings module is used.
  • The function is unused, was marked as deprecated (raising a DeprecationWarning) and marked for later removal. PR #10104

Backward incompatible changes

Functions Removed in 6.x Development cycle

The following functions have been removed in the development cycle marked for Milestone 6.0.

  • IPython/utils/ - is_cmd_found
  • IPython/utils/ - pycmd2argv
  • The --deep-reload flag and the corresponding options to inject dreload or reload into the interactive namespace have been removed. You have to explicitly import reload from IPython.lib.deepreload to use it.
  • The %profile used to print current IPython profile in use, and which was deprecated in IPython 2.0 does now raise a DeprecationWarning error when used. It is often confused with the %prun and the deprecation remove should free up the profile name in future versions.