6.x Series — IPython 9.2.0 documentation (original) (raw)

IPython 6.5.0

Miscellaneous bug fixes and compatibility with Python 3.7.

IPython 6.4.0

Everything new in IPython 5.7

IPython 6.3.1

This is a bugfix release to switch the default completions back to IPython’s own completion machinery. We discovered some problems with the completions from Jedi, including completing column names on pandas data frames.

You can switch the completions source with the config optionCompleter.use_jedi.

IPython 6.3

IPython 6.3 contains all the bug fixes and features inIPython 5.6. In addition:

You can see all pull requests for the 6.3 milestone.

IPython 6.2

IPython 6.2 contains all the bugs fixes and features available in IPython 5.5, like built in progress bar support, and system-wide configuration

The following features are specific to IPython 6.2:

Function signature in completions

Terminal IPython will now show the signature of the function while completing. Only the currently highlighted function will show its signature on the line below the completer by default. This functionality is recent, so it might be limited; we welcome bug reports and requests for enhancements. PR #10507

Assignments return values

IPython can now trigger the display hook on the last assignment of cells. Up until 6.2 the following code wouldn’t show the value of the assigned variable:

In[1]: xyz = "something"

nothing shown

You would have to actually make it the last statement:

In [2]: xyz = "something else" ... : xyz Out[2]: "something else"

With the option InteractiveShell.ast_node_interactivity='last_expr_or_assign'you can now do:

In [2]: xyz = "something else" Out[2]: "something else"

This option can be toggled at runtime with the %config magic, and will trigger on assignment a = 1, augmented assignment +=, -=, |= … as well as type annotated assignments: a:int = 2.

See PR #10598

Recursive Call of ipdb

Advanced users of the debugger can now correctly recursively enter ipdb. This is thanks to @segevfiner on PR #10721.

IPython 6.1

The following changes were also added to IPython 5.4, see what’s new in IPython 5.4for more detail description:

IPython 6.0

Released April 19th, 2017

IPython 6 features 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 for 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

Note

If your pip version is greater than or 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 has plenty of improvements both from the end users of terminal IPython and 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, completions like the following are now 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 bug-fixes 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 thec.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 fixes a number of bugs like case-insensitive completion and completion after division operator: SeePR #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 should be barely noticeable on recent machines, but can be slower on older ones. To tweak the performance, the amount of time given to Jedi to compute type inference can be adjusted withc.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 the near future. Feedback on the current state of the API and suggestions are 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 has led to upstream patches in pip, pypi and warehouse to make sure Python 2 systems still upgrade to the latest compatible Python version.

We remind our Python 2 users that IPython 5 is still compatible with Python 2.7, still maintained and will 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 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 advantages. 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 of the Python2/Python3 shim layer has made the code quite a lot clearer and more idiomatic in a number of locations, and much friendlier to work with and understand. We hope to further embrace Python 3 capabilities in the next release cycle and introduce more of the Python 3 only idioms (yield from, kwarg only, general unpacking) in the IPython code base, and see if we can take advantage of these 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.

Misc improvements

Functions Deprecated in 6.x Development cycle

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.