ipython/ipython — pull request #2681 by tomspur (2012-12-14 12:56:08+00:00)
Title: Don't enable pylab mode, when matplotlib is not importable

On a headless server, matplotlib is a unnecessary dependency and the ipython
console will crash badly, when tring to enable %pylab there.
In that case, just don't enable %pylab and ask the user to install matplotlib.

Original bug report: https://bugzilla.redhat.com/show_bug.cgi?id=872176