title: PyQt: How Can I set row heights of QTreeView
body: <p>In PyQt, I am looking for a way to set the height of rows in a <code>QTreeView</code> (similarly to <code>QTableView.setRowHeight(row, row_height)</code>, but <code>QTreeView</code> does not have this function). <code>QAbstractItemModel</code> is used to set the tree model. I read some suggestions <a href="http://www.developpez.net/forums/d875894/c-cpp/bibliotheques/qt/changer-hauteur-d-rangee-qtreewidget/" rel="noreferrer">here</a> using and sub-classing <code>QAbstractItemDelegate.sizeHint(option, index)</code> but I don't know exactly how to call them correctly within my tree model. </p>
  
  <p>Any minimal code or suggestion would be greatly appreciated. Thanks.</p>