I would also suggest not using pylab. I suspect we will find a lot of these edge cases as people start to use mpl with pypy.

actually,I just have a try like this:

import matplotlib
%matplotlib inline

Looks like have many difference between CPython and PyPy such as execution model/ type system, I'll give a try to figure out the truth

Ah, the problem is that IPython imports pylab

09:40 $ git grep 'import pylab'
Python/core/interactiveshell.py:        from IPython.core import pylabtools as pt
IPython/core/magics/pylab.py:            from matplotlib import pylab, mlab, pyplot
IPython/core/pylabtools.py:          "from matplotlib import pylab, mlab, pyplot\n"
IPython/core/shellapp.py:from IPython.core import pylabtools
IPython/core/tests/test_pylabtools.py:from .. import pylabtools as pt
IPython/sphinxext/ipython_directive.py:            # setting its backend since exec_lines might import pylab.
IPython/terminal/ipapp.py:            "    Use `--matplotlib <backend>` and import pylab manually.")

does it do so unconditionally?

On Wed, Sep 28, 2016 at 9:42 AM, Thomas A Caswell notifications@github.com
wrote:

Ah, the problem is that IPython imports pylab

09:40 $ git grep 'import pylab'
Python/core/interactiveshell.py: from IPython.core import pylabtools as pt
IPython/core/magics/pylab.py: from matplotlib import pylab, mlab, pyplot
IPython/core/pylabtools.py: "from matplotlib import pylab, mlab, pyplot\n"
IPython/core/shellapp.py:from IPython.core import pylabtools
IPython/core/tests/test_pylabtools.py:from .. import pylabtools as pt
IPython/sphinxext/ipython_directive.py: # setting its backend since exec_lines might import pylab.
IPython/terminal/ipapp.py: " Use --matplotlib <backend> and import pylab manually.")

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IPython imports pylab when use %matplotlib inline magic mode
I change mpl to svg mode and it works

eh… ipython still imports pylab? I thought that was deprecated a long time ago?

Yes, are you sure it's happening with %matplotlib inline? Also, how old is your ipython? From the code, it appears that only the %pylab magic should import all the extra stuff, and this should have been true since at least the 3.x line.

Actually, scratch that. There's a lot of indirection to trawl through, but it appears there is a matplotlib.pylab import here. It does not insert this into the namespace though, which is a key difference between the %matplotlib and %pylab magics. I'm not sure it's really necessary; that sort of thing probably should be reported downstream so they can stop using it.

ipython/ipython#9998 <- IPython PR to fix at least some of this.

and for 1.5.3 + the %matplotlib magic isn't needed anymore, importingpyplotand callingplt.ion()` is now sufficient to properly hook up the event loops