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Provide and easier way to generate magics and pre-post hooks...
Provide and easier way to generate magics and pre-post hooks This introduce a code base way of modifying the ast. This allow to use Template strings with the two special variable names names `__code__` and `__ret__` allowing to quickly write a magic, or hooks that modify the ast. This also introduce a `%code_wrap` cell magic to on the fly wrap code. It is this easy to for example modify IPython to say time each block of code, or retry them, or wrap them in try/except and analyse the error message, profile... Note that this is not new, but simply convenience function and utilities, especially around hygiene.
Matthias Bussonnier -
r28323:548406db
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Documenting What's New

When making a new pull request that either adds a new feature, or makes a
backwards-incompatible change to IPython, please add a new .rst file in this
directory documenting this change as a part of your Pull Request.

This will allow multiple Pull Requests to do the same without conflicting with
one another. Periodically, IPython developers with commit rights will run a
script and populate development.rst
with the contents of this directory, and clean it up.

Files which describe new features can have any name, such as
antigravity-feature.rst, whereas backwards incompatible changes must have
have a filename starting with incompat-, such as
incompat-switching-to-perl.rst. Our "What's new" files always have two
sections, and this prefix scheme will make sure that the backwards incompatible
changes get routed to their proper section.

To merge these files into :file:whatsnew/development.rst, run the script :file:tools/update_whatsnew.py.