PyQt and matplotlib example.

pyqt_example.py

#!/usr/bin/env python

import sys, random

from PyQt4 import QtGui, QtCore

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):
    def __init__(self, parent = None, width = 1, height = 1):
        figure = Figure(figsize = (width, height))
        self.axes = figure.add_subplot(111)
        # We want the axes cleared every time plot() is called
        self.axes.hold(False)

        FigureCanvas.__init__(self, figure)
        self.setParent(parent)

        FigureCanvas.setSizePolicy(self, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

        self.update_figure()
        timer = QtCore.QTimer(self)
        timer.timeout.connect(self.update_figure)
        timer.start(1000)

    def update_figure(self):
        num_ints = 10
        random_ints = [ random.randint(0, 10) for i in range(num_ints) ]
        self.axes.plot(range(num_ints), random_ints, 'r')
        self.draw()

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

        self.setAttribute(QtCore.Qt.WA_DeleteOnClose) # Garbage-collect the window after it's been closed.
        self.setWindowTitle("Test window")

        main_widget = QtGui.QWidget(self)
        self.setCentralWidget(main_widget)

        box_layout = QtGui.QVBoxLayout(main_widget)

        canvas = MplCanvas(main_widget)
        box_layout.addWidget(canvas)

        self.show()

app = QtGui.QApplication(sys.argv)
app_window = MainWindow()
sys.exit(app.exec_())