import sys

# If using PyQt4, a push button will be shown on column 1 of the tree widget
from PyQt4 import QtGui

# If using PySide, no button will be shown on column 1 of the tree widget
#from PySide import QtGui

app = QtGui.QApplication(sys.argv)

treeWidget = QtGui.QTreeWidget()
treeWidget.setColumnCount(2)

item = QtGui.QTreeWidgetItem(['text of column 0', ''])
treeWidget.insertTopLevelItem(0, item)
treeWidget.setItemWidget(item, 1, QtGui.QPushButton('Push button on column 1'))

  
treeWidget.show()

app.exec_()
sys.exit()