Author: Nuno Araujo
Revision Date: 2014-09-03 20:11:45 UTC

Force the usage of matplotlib PyQt4 backend

matplotlib tries its backends on a given order
The PyQt5 backend comes before the PyQt4 backend.

On systems that have both backends installed, this caused a RuntimeError
due to conflicting PyQt versions:

    An unexpected error has occurred.
    Please forward the following info to the developers:

    Traceback (innermost last):
    File "/usr/bin/mnemosyne", line 191, in <module>
    debug_file=options.debug_file)
    File "/usr/lib/python2.7/site-packages/mnemosyne/libmnemosyne/__init__.py", line 172, in initialise
    self.register_components()
    File "/usr/lib/python2.7/site-packages/mnemosyne/libmnemosyne/__init__.py", line 242, in register_components
    exec("from %s import %s" % (module_name, class_name))
    File "<string>", line 1, in <module>
    File "/usr/lib/python2.7/site-packages/mnemosyne/pyqt_ui/statistics_wdgts_plotting.py", line 9, in <module>
    from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_qt4agg.py", line 17, in <module>
    from .backend_qt5agg import NavigationToolbar2QTAgg
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_qt5agg.py", line 18, in <module>
    from .backend_qt5 import QtCore
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_qt5.py", line 28, in <module>
    import matplotlib.backends.qt_editor.figureoptions as figureoptions
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/qt_editor/figureoptions.py", line 17, in <module>
    import matplotlib.backends.qt_editor.formlayout as formlayout
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/qt_editor/formlayout.py", line 58, in <module>
    from matplotlib.backends.qt_compat import QtGui, QtWidgets, QtCore
    File "/usr/lib/python2.7/site-packages/matplotlib/backends/qt_compat.py", line 91, in <module>
    from PyQt5 import QtCore, QtGui, QtWidgets
    RuntimeError: the PyQt5.QtCore and PyQt4.QtCore modules both wrap the QObject class

Author: Nuno Araujo
Revision Date: 2012-12-19 17:36:30 UTC

Some minor fixes to the previous commit