matplo_gui.py

import sys
from PyQt5 import QtWidgets
from matplo_ui import Ui_Form

#below import libraries about matplotlib runing on pyqt5 
import matplotlib
#Make sure that we are using QT5
matplotlib.use('Qt5Agg')
from PyQt5 import QtCore, QtWidgets
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

import random
from numpy import arange, sin, pi

class MyMplCanvas(FigureCanvas):

	def __init__(self, parent=None, width=10, height=8, dpi=100):
		fig = Figure(figsize=(width, height), dpi=dpi)
		self.axes = fig.add_subplot(111)

		self.compute_initial_figure()

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

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

	def compute_initial_figure(self):
		pass

class MyStaticMplCanvas(MyMplCanvas):

	def compute_initial_figure(self):
		t = arange(0.0, 3.0, 0.01)
		s = sin(2*pi*t)
		self.axes.plot(t, s)


class Form(QtWidgets.QDialog):
	def __init__(self, parent=None):
		super(Form, self).__init__(parent)
		self.ui = Ui_Form()
		self.ui.setupUi(self)
		self.l = QtWidgets.QVBoxLayout(self.ui.widget)

	def show_graph(self):
		sc = MyStaticMplCanvas(self.ui.widget, width=5, height=4, dpi=100)
		self.l.addWidget(sc)

if __name__ == '__main__':
	app = QtWidgets.QApplication(sys.argv)
	window = Form()
	window.show()
	sys.exit(app.exec_())