Following up, after a bit of research...

It seems it's alla about QString (which is gone in api 2)
it is suggested to convert the QString into a unicode python2 string
http://wiki.python.org/moin/PortingPythonToPy3k/PyQt4

Do you think could be the way to go for the qt backend?

Cheers,
Michele.

On Fri, Feb 25, 2011 at 12:30 AM, Michele Mattioni <matti...@gmail.com> wrote:
> Dear list,
>
> I'm trying to to use matplotlib in a Qt application which needs the
> sip API set to 2
>
>        import sip
>        sip.setapi('QString', 2)
>
> However if I do this I get this error
>
>        ImportError: cannot import name QString
>
> I'm wondering if I'm the first to stumble upon this one, or this is a
> known solution.
>
> Below the whole Traceback.
>
> Thanks,
> Michele.
>
>
>        In [3]: import sip
>
>        In [4]: sip.setapi('QString', 2)
>
>        In [5]: import matplotlib.pyplot as plt
>        
> ---------------------------------------------------------------------------
>        ImportError                               Traceback (most recent call 
> last)
>
>        /home/mattions/Work/model/MSN/Neuronvisio/examples/<ipython console>
> in <module>()
>
>        /usr/lib/pymodules/python2.6/matplotlib/pyplot.py in <module>()
>                 93
>                 94 from matplotlib.backends import pylab_setup
>        ---> 95 new_figure_manager, draw_if_interactive, show = pylab_setup()
>                 96
>                 97 @docstring.copy_dedent(Artist.findobj)
>
>        /usr/lib/pymodules/python2.6/matplotlib/backends/__init__.pyc in 
> pylab_setup()
>                 23         backend_name = 
> 'matplotlib.backends.%s'%backend_name.lower()
>                 24     backend_mod = __import__(backend_name,
>        ---> 25                              globals(),locals(),[backend_name])
>                 26
>                 27     # Things we pull in from all backends
>
>
>        /usr/lib/pymodules/python2.6/matplotlib/backends/backend_qt4agg.py in
> <module>()
>                 10
>                 11 from backend_agg import FigureCanvasAgg
>        ---> 12 from backend_qt4 import QtCore, QtGui, FigureManagerQT,
> FigureCanvasQT,\
>                 13      show, draw_if_interactive, backend_version, \
>                 14      NavigationToolbar2QT
>
>        /usr/lib/pymodules/python2.6/matplotlib/backends/backend_qt4.py in 
> <module>()
>                 14 from matplotlib.mathtext import MathTextParser
>                 15 from matplotlib.widgets import SubplotTool
>        ---> 16 import matplotlib.backends.qt4_editor.figureoptions as 
> figureoptions
>                 17
>                 18 try:
>
>        
> /usr/lib/pymodules/python2.6/matplotlib/backends/qt4_editor/figureoptions.py
> in <module>()
>                  9 import os.path as osp
>                 10
>        ---> 11 import matplotlib.backends.qt4_editor.formlayout as formlayout
>                 12 from PyQt4.QtGui import QIcon
>                 13
>
>        
> /usr/lib/pymodules/python2.6/matplotlib/backends/qt4_editor/formlayout.py
> in <module>()
>                 57                          QDateEdit, QDateTimeEdit, QFont, 
> QFontComboBox,
>                 58                          QFontDatabase, QGridLayout)
>        ---> 59 from PyQt4.QtCore import (Qt, SIGNAL, SLOT, QSize, QString,
>                 60                           pyqtSignature, pyqtProperty)
>                 61 from datetime import date
>
>        ImportError: cannot import name QString
>
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