Arch Linux

lucacerone

Member

From: Spain

Registered: 2012-05-04

Posts: 144

Website

[SOLVEDipython 2 notebook: issue when using %matplotlib inline

Hi, I have installed ipython2 on my Arch machine,
but I am experiencing some issues with my matplotlib backend.

At the beginning of a notebook I run:

%matplotlib inline

and then when I run

%pylab

the following error message appears:

Using matplotlib backend: Qt5Agg
Populating the interactive namespace from numpy and matplotlib
ERROR:tornado.application:Exception in callback <functools.partial object at 0x7f2bbfc02f70>
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'

I have tried as well with ipython (python 3.4.2) and am experiencing the same issue.
Of course I have python-pyqt5 and python2-pyqt5 ias well as the matplotlib paccages installed (all using pacman)

On another laptop where I have ubuntu installed everything works just fine. I am not sure if I am missing some dependencies, it is a bug in the versions shipped with Arch,
or I simply need some configuration

I cannot make things work, can you give me some help?
Thanks in advance for the help!

Last edited by lucacerone (2015-01-14 01:54:14)

lucacerone

Member

From: Spain

Registered: 2012-05-04

Posts: 144

Website

Re: [SOLVEDipython 2 notebook: issue when using %matplotlib inline

The issue is fixed by using "inline" for both matplotlib and pylab.
Marking as solved.