gyu-don

import sys
from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        widget = QtGui.QWidget()
        widget1 = QtGui.QLabel("Page 1", widget)
        widget2 = QtGui.QLabel("Page 2", widget)

gyu-don

import sys
from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        widget1 = QtGui.QDockWidget("Page 1")
        widget1.setWidget(QtGui.QLabel("Page 1"))
        widget2 = QtGui.QDockWidget("Page 2")

gyu-don

import sys
from PyQt4 import QtGui, QtCore

#http://stackoverflow.com/questions/36675609/how-can-i-create-multi-page-applications-in-pyqt4/36676917

class Window(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        widget1 = QtGui.QLabel("Page 1")