Simple QTreeView example

QTreeView.1.py

#! /usr/bin/env python3
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# In this prototype/example a QTreeView is created. Then it's populated with
# three containers and all containers are populated with three rows, each 
# containing three columns.
# Then the last container is expanded and the last row is selected.
# The container items are spanned through the all columns.
# Note: this requires > python-3.2
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import sys, os, pprint, time
from PySide.QtCore import *
from PySide.QtGui import *
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
app = QApplication(sys.argv)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# init widgets
view = QTreeView()
view.setSelectionBehavior(QAbstractItemView.SelectRows)
model = QStandardItemModel()
model.setHorizontalHeaderLabels(['col1', 'col2', 'col3'])
view.setModel(model)
view.setUniformRowHeights(True)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# populate data
for i in range(3):
    parent1 = QStandardItem('Family {}. Some long status text for sp'.format(i))
    for j in range(3):
        child1 = QStandardItem('Child {}'.format(i*3+j))
        child2 = QStandardItem('row: {}, col: {}'.format(i, j+1))
        child3 = QStandardItem('row: {}, col: {}'.format(i, j+2))
        parent1.appendRow([child1, child2, child3])
    model.appendRow(parent1)
    # span container columns
    view.setFirstColumnSpanned(i, view.rootIndex(), True)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# expand third container
index = model.indexFromItem(parent1)
view.expand(index)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# select last row
selmod = view.selectionModel()
index2 = model.indexFromItem(child3)
selmod.select(index2, QItemSelectionModel.Select|QItemSelectionModel.Rows)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
view.show()
sys.exit(app.exec_())
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cool example! The only downside is that PySide and PyQt4 mentioned in the comment above are a bit old by now. I've uploaded a more modern QTreeView example in Python. It's based on PyQt5. Maybe someone will find it useful :-)

It needs some more imports and the QItemSelectionModel is still not found. But when one comments that lines out, it still works.
I do not understand how the rows and columns are counted...:

Family x -> Row x . O.K.
But colum is unclear I would expect:
Row: 0, Col 1 Row: 0 col 2
Row: 0, Col 1 Row: 0 col 2
Row: 0, Col 1 Row: 0 col 2

Row 1: col 1 Row 1 col 2
Row 1: col 1 Row 1 col 2
Row 1: col 1 Row 1 col 2

But The app shows:
Row: 0, Col 1 Row: 0 col 2
Row: 0, Col 2 Row: 0 col 3
Row: 0, Col 3 Row: 0 col 4
???