===================== Development version ===================== This document describes in-flight development work. .. warning:: Please do not edit this file by hand (doing so will likely cause merge conflicts for other Pull Requests). Instead, create a new file in the `docs/source/whatsnew/pr` folder IPython 6.0 =========== Released .... ...., 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: .. code:: pip install ipython --upgrade .. note:: 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. THat is to day 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 :any:`jedi`, thus allowing type inference on non-executed code. If :any:`jedi` is installed completion like the following are now becoming possible without code evaluation: >>> data = ['Number of users', 123_456] ... data[0]. 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 development version of :any:`jedi` if you are curious. With the help of prompt toolkit, types of completions can be shown in the completer interface: .. image:: ../_images/jedi_type_inference_60.png :alt: Jedi showing ability to do type inference :align: center :width: 400px :target: ../_images/jedi_type_inference_60.png 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 full fill a number of request and fix a number of bugs like case insensitive completion, completion after division operator: See :ghpull:`10182`. Extra patches and updates will be needed to the :mod:`ipykernel` package for this feature to be available to other clients like jupyter Notebook, Lab, Nteract, Hydrogen... The use of Jedi can is barely noticeable on recent enough machines, but can be feel on older ones, in cases were Jedi behavior need to be adjusted, the amount of time given to Jedi to compute type inference can be adjusted with ``c.IPCompleter.jedi_compute_type_timeout``, with object whose type were not inferred will be shown as ````. 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 code base, which lead 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. .. warning:: If you are on a system using an older verison 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 ugrading 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 has bring a number of advantage. Most of the newly written code make use of `optional function type anotation `_ leading to clearer code and better documentation. The total size of the repository has also for a first time between releases (excluding the big split for 4.0) decreased by about 1500 lines, potentially quite a bit more codewide 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 allow to customize the class used to start the terminal frontend. This should allow 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 :cellmagic:`capture` magic can now capture the result of a cell (from an expression on the last line), as well as printed and displayed output. :ghpull:`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 :ghissue:`10232` and :ghpull:`10316` - IPython.display has gained a :any:`GeoJSON ` object. :ghpull:`10288` and :ghpull:`10253` .. DO NOT EDIT THIS LINE BEFORE RELEASE. FEATURE INSERTION POINT. Functions Deprecated in 6.x Development cycle ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Loading extensions from ``ipython_extension_dir`` print 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 :any:`warnings` module is used. - The function `IPython.core.oinspect.py:call_tip` is unused, was marked as Deprecated (raising a Deprecation Warning) and marked for later removal :ghpull:`10104` Backwards 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/process.py`` - ``is_cmd_found`` - ``IPython/utils/process.py`` - ``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 :magic:`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 :magic:`prun` and the deprecation remove should free up the ``profile`` name in future versions. .. DO NOT EDIT THIS LINE BEFORE RELEASE. INCOMPAT INSERTION POINT.