Вывести график matplotlib в QWidget

from __future__ import unicode_literals
import sys
import os
import random
from PyQt4 import QtCore, QtGui
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
 
x = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]
y = [44,556,53,345,34,45,44,22,435,1,232,343,345,67,11,42,23,43]
print(x, '\n')
print(y, '\n')
#---------------------------------------
# Первая область рисования
plt.plot(x, y, '-', color='blue', linewidth=1)
#---------------------------------------
        
# Рисуем пользовательскую форму------------------------
try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s
 
try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)
 
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(774, 418)
        self.pushButton = QtGui.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(660, 280, 75, 23))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.my_widget = QtGui.QWidget(Form)
        self.my_widget.setGeometry(QtCore.QRect(20, 10, 741, 241))
        self.my_widget.setObjectName(_fromUtf8("my_widget"))
 
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)
 
    def retranslateUi(self, Form):
        Form.setWindowTitle(_translate("Form", "Form", None))
        self.pushButton.setText(_translate("Form", "PushButton", None))
# Рисуем пользовательскую форму------------------------
 
plt.show()#это рисует matplotlib график
 
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(window)
QtCore.QObject.connect(ui.pushButton, QtCore.SIGNAL("clicked()"), QtGui.qApp.quit)
window.show()
sys.exit(app.exec_())