old_contents: import os
  from pyqode.qt import QT_API
  from pyqode.qt import PYQT5_API
  from pyqode.qt import PYQT4_API
  from pyqode.qt import PYSIDE_API
  
  try:
      if os.environ[QT_API] == PYQT5_API:
          from PyQt5.QtCore import *
          from PyQt5.Qt import Qt
          from PyQt5.QtCore import pyqtSignal as Signal
          from PyQt5.QtCore import pyqtSlot as Slot
          from PyQt5.QtCore import pyqtProperty as Property
          from PyQt5.QtCore import QT_VERSION_STR as __version__
      elif os.environ[QT_API] == PYQT4_API:
          from PyQt4.QtCore import *
          from PyQt4.Qt import Qt
          from PyQt4.QtCore import pyqtSignal as Signal
          from PyQt4.QtCore import pyqtSlot as Slot
          from PyQt4.QtCore import pyqtProperty as Property
          from PyQt4.QtCore import QT_VERSION_STR as __version__
      elif os.environ[QT_API] == PYSIDE_API:
          from PySide.QtCore import *
          import PySide.QtCore
          __version__ = PySide.QtCore.__version__
  except ImportError:
      # allowed when building doc with sphinx (on readthedocs)
      assert os.environ.get('SPHINX', None) == '1'
  
      class Qt(object):
          blue = None
          red = None
  
      class QObject(object):
          pass
  
      class Signal(object):
          def __init__(self, *args):
              pass
  
      def Slot(*types):
          def decorator(func):
              import functools
  
              @functools.wraps(func)
              def wrapper(*args, **kwds):
                  return func(*args, **kwds)
              return wrapper
          return decorator
  
      class QThread(object):
          pass
  
      class QEvent(object):
          @staticmethod
          def Type(foo):
              pass
  
          @staticmethod
          def registerEventType():
              pass
  
      def qRegisterResourceData(*args):
          pass
  
      class QRegExp(object):
          pass
  
      class Property(object):
          def __init__(self, *args, **kwargs):
              pass
  
      class QProcess:
          pass
  
      class QProcessEnvironment:
          pass
  
new_contents: import os
  from pyqode.qt import QT_API
  from pyqode.qt import PYQT5_API
  from pyqode.qt import PYQT4_API
  from pyqode.qt import PYSIDE_API
  
  try:
      if os.environ[QT_API] == PYQT5_API:
          from PyQt5.QtCore import *
          from PyQt5.Qt import Qt
          from PyQt5.QtCore import pyqtSignal as Signal
          from PyQt5.QtCore import pyqtSlot as Slot
          from PyQt5.QtCore import pyqtProperty as Property
          from PyQt5.QtCore import QT_VERSION_STR as __version__
      elif os.environ[QT_API] == PYQT4_API:
          from PyQt4.QtCore import *
          from PyQt4.Qt import Qt
          from PyQt4.QtCore import pyqtSignal as Signal
          from PyQt4.QtCore import pyqtSlot as Slot
          from PyQt4.QtCore import pyqtProperty as Property
          from PyQt4.QtCore import QT_VERSION_STR as __version__
          from PyQt4.QtGui import QSortFilterProxyModel
      elif os.environ[QT_API] == PYSIDE_API:
          from PySide.QtCore import *
          import PySide.QtCore
          __version__ = PySide.QtCore.__version__
          from PySide.QtGui import QSortFilterProxyModel
  except ImportError:
      # allowed when building doc with sphinx (on readthedocs)
      assert os.environ.get('SPHINX', None) == '1'
  
      class Qt(object):
          blue = None
          red = None
  
      class QObject(object):
          pass
  
      class Signal(object):
          def __init__(self, *args):
              pass
  
      def Slot(*types):
          def decorator(func):
              import functools
  
              @functools.wraps(func)
              def wrapper(*args, **kwds):
                  return func(*args, **kwds)
              return wrapper
          return decorator
  
      class QThread(object):
          pass
  
      class QEvent(object):
          @staticmethod
          def Type(foo):
              pass
  
          @staticmethod
          def registerEventType():
              pass
  
      def qRegisterResourceData(*args):
          pass
  
      class QRegExp(object):
          pass
  
      class Property(object):
          def __init__(self, *args, **kwargs):
              pass
  
      class QProcess:
          pass
  
      class QProcessEnvironment:
          pass
  
subject: Add missing QSortFilterProxyModel to pyqode.qt.QtCore