pyuic4 mainWindow.ui -o -mainWindow.py Traceback (most recent call last): File "/usr/bin/pyuic4", line 3, in <module> import PyQt4.uic.pyuic File "/usr/lib/pymodules/python2.6/PyQt4/uic/pyuic.py", line 4, in <module> from PyQt4 import QtCore RuntimeError: the sip module implements API v8.0 to v8.1 but the PyQt4.QtCore module requires API v7.1