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from PyQt4 import QtCore, QtGui

class WidgetComboBoxTree(QtGui.QTreeView):

  def __init__(self, parent=None):
    QtGui.QTreeView.__init__(self, parent)
    self.setUniformRowHeights(True)
    self.setRootIsDecorated(True)
    self.setItemsExpandable(True)
    self.setSortingEnabled(True)
    self.setSelectionBehavior(QtGui.QTreeView.SelectRows)
    self.header().setVisible(False)
    self.setMinimumHeight(150)

class WidgetTreeCombo(QtGui.QComboBox):
  __curItem = None
  __tree = None

  def __init__(self, parent=None):
    QtGui.QComboBox.__init__(self)
    self.__tree = WidgetComboBoxTree()
    self.setView(self.__tree)

  def hidePopup(self):
    self.__setCurModInd(self.view().currentIndex())
    return QtGui.QComboBox.hidePopup(self)

  def showPopup(self):
    QtGui.QComboBox.showPopup(self)
    self.setRootModelIndex(QtCore.QModelIndex())
    self.__tree.expandAll()

  def currentModelIndex(self):
    return self.__curItem

  def setModel(self, model, sortOrder=QtCore.Qt.AscendingOrder):
    if sortOrder in (QtCore.Qt.AscendingOrder, QtCore.Qt.DescendingOrder):
      self.__tree.header().setSortIndicator(0, sortOrder)
    QtGui.QComboBox.setModel(self, model)

  def setCurrentModelIndex(self, modelIndex):
    self.__setCurModInd(modelIndex)
    self.setCurrentIndex(modelIndex.isValid() and modelIndex.row() or 0)

  def tree(self):
    return self.__tree

  def __setCurModInd(self, idx):
    if idx and idx.isValid:
      self.__curItem = QtCore.QPersistentModelIndex(idx)
      self.setRootModelIndex(self.__curItem.parent())
    else:
      self.__curItem = None
      self.setRootModelIndex(QtCore.QModelIndex())

def str_sqare(s_in):
 return ' '.join(int(x)*int(x) for x in s_in.split())

QString str_square(const QString &s_in)
{
  QTextStream ts(&s_in);
  QString s;
  QTextStream ts2(&s);
  double d;
  while (!ts.atEnd()) {
     ts >> d; s << d*d << " ";
  }
  return s;
}

struct test_t {
  test_t() : {cout<<"test_t"<<endl;}
  ~test_t() {cout<<"~test_t"<<endl;}
};
int main() {
  return sizeof test_t(666);
}
//вывод
~test_t

QString str_square(const QString &s_in) {
  QStringList tmp;
  foreach (QString str, s_in.trimmed().split(QRegExp("\\s+"))) {
    int i = str.toInt();
    tmp.push_back(QString::number(i * i));
  }
  return tmp.join(" ");
}