Re: [Matplotlib-users] Python 3

On Mon, Jan 3, 2011 at 9:45 AM, Ryan May <rm...@gm...> wrote:
> On Sun, Jan 2, 2011 at 12:24 PM, Xavier Gnata <xav...@gm...> wrote:
>> which backend should we use?
>> It does not work with pyqt4
>>
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "/usr/local/lib/python3.1/dist-packages/pylab.py", line 1, in
>> <module>
>>     from matplotlib.pylab import *
>>   File "/usr/local/lib/python3.1/dist-packages/matplotlib/pylab.py",
>> line 259, in <module>
>>     from matplotlib.pyplot import *
>>   File "/usr/local/lib/python3.1/dist-packages/matplotlib/pyplot.py",
>> line 95, in <module>
>>     new_figure_manager, draw_if_interactive, show = pylab_setup()
>>   File
>> "/usr/local/lib/python3.1/dist-packages/matplotlib/backends/__init__.py", line
>> 25, in pylab_setup
>>     globals(),locals(),[backend_name])
>>   File
>> "/usr/local/lib/python3.1/dist-packages/matplotlib/backends/backend_qt4agg.py",
>> line 12, in <module>
>>     from .backend_qt4 import QtCore, QtGui, FigureManagerQT,
>> FigureCanvasQT,\
>>   File
>> "/usr/local/lib/python3.1/dist-packages/matplotlib/backends/backend_qt4.py",
>> line 16, in <module>
>>     import matplotlib.backends.qt4_editor.figureoptions as figureoptions
>>   File
>> "/usr/local/lib/python3.1/dist-packages/matplotlib/backends/qt4_editor/figureoptions.py",
>> line 11, in <module>
>>     import matplotlib.backends.qt4_editor.formlayout as formlayout
>>   File
>> "/usr/local/lib/python3.1/dist-packages/matplotlib/backends/qt4_editor/formlayout.py",
>> line 59, in <module>
>>     from PyQt4.QtCore import (Qt, SIGNAL, SLOT, QSize, QString,
>> ImportError: cannot import name QString
>>
>> Looks like this backend hasn't been ported yet.
>
> I remember seeing this on Gentoo and, unfortunately, never tracked it
> down. However, it seems to me this is a problem with your PyQt4
> install and Python 3, as QString should be found.

It's not a problem with the PyQt4 installation. PyQt on python-3 uses
PyQt's new API, which uses python strings and does not provide
QString, QChar, and friends.
http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/pyqt4ref.html#selecting-incompatible-apis

Darren