old_contents: from PyQt5 import QtGui,QtCore,QtWidgets
  
new_contents: import os
  if os.environ['SPARK17_QT_LIB'] == 'PyQt5':
  	from PyQt5 import QtGui,QtCore,QtWidgets
  else:
  	print ('using PyQt4')
  	from PyQt4 import QtGui,QtCore
  	from PyQt4 import QtGui as QtWidgets
  
subject: Update Qt.py