[IPython-dev] problems with ipython qtconsole --pylab on arch linux

[Thomas Kluyver]

I'd hazard a guess that Arch has set matplotlib's default backend to
qt5agg, but that's not supported by the released version of IPython. 3.0
and 2.4 will support Qt 5.

In the meantime, you should be able to work around it by specifying another
backend, e.g. --pylab qt4 or --pylab inline.

Thomas

On 29 January 2015 at 15:59, Mark Andrews <mjandrews.net at gmail.com> wrote:

> After a recent upgrade on arch linux (where I have been using ipython for
> years), I just encountered the following problem when I start ipython
> (2.3.1) with "ipython2 qtconsole --pylab"
>
> Using matplotlib backend: Qt5Agg
>
> ERROR:tornado.application:Exception in callback <functools.partial object
> at 0x7fcac006c838>
>
> Traceback (most recent call last):
>
> File "/usr/lib/python2.7/site-packages/tornado/ioloop.py", line 565, in
> _run_callback
>
> ret = callback()
>
> File "/usr/lib/python2.7/site-packages/tornado/stack_context.py", line
> 275, in null_wrapper
>
> return fn(*args, **kwargs)
>
> File "/usr/lib/python2.7/site-packages/IPython/kernel/zmq/ipkernel.py",
> line 262, in enter_eventloop
>
> self.eventloop(self)
>
> File "/usr/lib/python2.7/site-packages/IPython/kernel/zmq/eventloops.py",
> line 71, in loop_qt5
>
> return loop_qt4(kernel)
>
> File "/usr/lib/python2.7/site-packages/IPython/kernel/zmq/eventloops.py",
> line 60, in loop_qt4
>
> kernel.app = get_app_qt4([" "])
>
> File "/usr/lib/python2.7/site-packages/IPython/lib/guisupport.py", line
> 111, in get_app_qt4
>
> from IPython.external.qt_for_kernel import QtGui
>
> File "/usr/lib/python2.7/site-packages/IPython/external/qt_for_kernel.py",
> line 84, in <module>
>
> from IPython.external.qt import QtCore, QtGui, QtSvg, QT_API
>
> File "/usr/lib/python2.7/site-packages/IPython/external/qt.py", line 17,
> in <module>
>
> (QT_API, QT_API_PYSIDE, QT_API_PYQT))
>
> RuntimeError: Invalid Qt API 'pyqt5', valid values are: 'pyside', 'pyqt'
>
>
> If I start with "ipython2 qtconsole" and then do
>
> %matplotlib inline
>
> import matplotlib.pyplot
>
>
> then plotting works fine.
>
>
> I am guessing that this is something that arises only with arch, and has
> something to do with its packages for python Qt bindings.
>
>
> Here are some of other relevant packages I am using
>
> python2-matplotlib 1.4.2-3
>
> python2-pyqt4 4.11.3-1
> python2-pyqt5 5.4.0-2
>
>
> It is not a major hassle but it would be good know what is causing this.
>
>
> -m
>
>
> ps. ipython2 is arch linux's name for ipython 2.x, while the name ipython
> is for ipython 3.x.
>
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>
>
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