title: PyQt and QtreeView : How get the path from the selected file
body: <p>I'am a beginner with PyQt. All is in the title :I don't understand how can I get the path (and the name) from the selected file?
  I wish later update a QListView with this path.</p>
  
  <p>Here my script :</p>
  
  <pre><code># -*- coding: utf-8 -*-
  from PyQt4.QtGui import *
  from PyQt4.QtCore import *
  
  import sys
  
  class MyWidget(QWidget):
      # SIGNAUX
      tree_model_indexSig = pyqtSignal(QModelIndex)
  
      def __init__(self, parent=None):
          super(MyWidget, self).__init__(parent)
  
          # connect signaux to slots
          self.tree_model_indexSig.connect(self.indexSlot)
  
          self.model = QFileSystemModel()
          self.model.setRootPath(QDir.rootPath())
  
          ''' GUI '''
          # instantiation du treeview et du listview
          self.treeView = QTreeView(self)
          self.treeView.setGeometry(QRect(10, 20, 601, 231))
          self.treeView.setObjectName("treeView")
  
          ''' END GUI '''
  
          self.treeView.setModel(self.model)
          self.treeView.setRootIndex(self.model.index(QDir.rootPath()))
          # clicked.CONNECT
          self.treeView.clicked.connect(self.treeClicked)
          self.treeView.show()
  
  
      def treeClicked(self, checked=False):
          # EMIT 
          self.tree_model_indexSig.emit(self.model.index(QDir.rootPath()))
      # Definition des slots
      def indexSlot(self, *args):
          # 1 argument --&gt; ModelIndex
          path = QDirModel(args[0]).filePath(args[0].currentIndex())
          print path
          '''
          How get the path from the selected file ??
          '''
  
  if __name__=='__main__':
      app = QApplication(sys.argv)
      widget = MyWidget()
      widget.show()
      app.exec_()
  </code></pre>
  
  <p>Thanks for help!</p>