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    <p><code>--pylab[=option]</code> is almost technically equivalent to <code>%pylab option</code> as the difference that you cannot un-pylab a <code>--pylab</code> kernel, but you can restart a <code>%pylab</code> kernel.</p> <p><code>%pylab</code> is a little more that just <code>from pylab import *</code> (see <code>%pylab?</code>for a longer explanation), but in short yes it imports a lot of things, but it also hooks event loops (qt, wx, osx...) and set-up some display hooks for matplotlib (the things that magically allow you to get inline graph). Setting the display-hook is closer to something like <code>sympy.init_printing()</code> if you wonder.</p> <p>Note that starting at IPython 1.0 we recommend not to use <code>--pylab</code> or <code>%pylab</code> (unless you know exactly the implication). We provide <code>%matplotlib</code> that only init the display hook. <code>%pylab</code> will warn you if it replaced a few object in current namespace, and which ones. This is useful especially for functions like <code>sum</code> which do not have the same behavior the behavior with and without pylab and leads to subtle bugs.</p> <p>We consider now that <code>--pylab</code> was a mistake, but that it was still really usefull at the beginning of IPython. We all know that <code>Explicit is better than implicit</code> so if you can advise people not to use <code>%pylab</code> we would appreciate it, to one day get rid of it. </p> <p>Extract from %pylab help that give only the import part of pylab:</p> <pre><code>%pylab makes the following imports:: import numpy import matplotlib from matplotlib import pylab, mlab, pyplot np = numpy plt = pyplot from IPython.display import display from IPython.core.pylabtools import figsize, getfigs from pylab import * from numpy import * </code></pre>
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