[Cython] Move IPython's cython extension to cython

[Robert Bradshaw]

On Fri, Apr 4, 2014 at 10:55 AM, Martín Gaitán <gaitan at gmail.com> wrote:
> As you probably know, IPython has a "cython magic" [1], an extension to
> interface ipython with cython, allowing to use cython code in the
> interactive session.
>
> Originally, few of these "language specific magics" (R, cython, octave, etc)
> were included builtin in IPython, but then the IPython core developers
> decided break out them (with fair arguments IMHO [2]), either to be included
> in the "language package" they depend on or as a third party extensions.
>
> At the moment,  cython-magic is the only one language specific extension
> left to move.
> The rest were moved to the packages they depend on [3]
>
> So, this message is to ask if the Cython project would like to import this
> code, task that  Brian Grangrer (the author of the cython-magic extension
> and IPython core dev)  entrusted me [3].
>
> Of course, I could help you preparing a PR that migrate the module, its
> tests and documentation, preserving the git history as far as possible.
>
> let me know your opinion/decision

I'd say this could generally make sense. Would it be the case that iff
cython is installed then the %cython magic would be available and just
work? Also, how testable is this (e.g. via automated tests vs. having
to fire up a notebook and test it manually)?

- Robert