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=====================
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Development version
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=====================
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This document describes in-flight development work.
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The CodeMirror js library has been updated fron 2.23 to 2.32
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this might induce a few changes in behavior of keymaps in the notebook,
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especially intenting/deindenting blocks that is now bound to Ctrl+] and ctr+[
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* Exception types can now be displayed with a custom traceback, by defining a
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``_render_traceback_()`` method which returns a list of strings, each
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containing one line of the traceback.
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* A new command, ``ipython history trim`` can be used to delete everything but
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the last 1000 entries in the history database.
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* The input transformation framework has been reworked. This fixes some corner
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cases, and adds more flexibility for projects which use IPython, like SymPy &
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SAGE. For more details, see :doc:`/config/inputtransforms`.
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In-process kernels
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------------------
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The Python-language frontends, particularly the Qt console, may now communicate
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with in-process kernels, in addition to the traditional out-of-process
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kernels. An in-process kernel permits direct access to the kernel namespace,
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which is necessary in some applications. It should be understood, however, that
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the in-process kernel is not robust to bad user input and will block the main
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(GUI) thread while executing. Developers must decide on a case-by-case basis
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whether this tradeoff is appropriate for their application.
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Backwards incompatible changes
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------------------------------
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* Calling :meth:`InteractiveShell.prefilter` will no longer perform static
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transformations - the processing of escaped commands such as ``%magic`` and
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``!system``, and stripping input prompts from code blocks. This functionality
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was duplicated in :mod:`IPython.core.inputsplitter`, and the latter version
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was already what IPython relied on. A new API to transform input will be ready
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before release.
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* Functions from :mod:`IPython.lib.inputhook` to control integration with GUI
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event loops are no longer exposed in the top level of :mod:`IPython.lib`.
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Code calling these should make sure to import them from
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:mod:`IPython.lib.inputhook`.
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* For all kernel managers, the ``sub_channel`` attribute has been renamed to
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``iopub_channel``.
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* Users on Python versions before 2.6.6, 2.7.1 or 3.2 will now need to call
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:func:`IPython.utils.doctestreload.doctest_reload` to make doctests run
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correctly inside IPython. Python releases since those versions are unaffected.
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For details, see :ghpull:`3068` and `Python issue 8048 <http://bugs.python.org/issue8048>`_.
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* The ``InteractiveShell.cache_main_mod()`` method has been removed, and
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:meth:`~IPython.core.interactiveshell.InteractiveShell.new_main_mod` has a
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different signature, expecting a filename where earlier versions expected
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a namespace. See :ghpull:`3555` for details.
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