from PySide2 import QtCore, QtWidgets

import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MatplotlibWidget(QtWidgets.QWidget):
    def __init__(self, size=(5.0, 4.0), dpi=100):
        QtWidgets.QWidget.__init__(self)
        self.figure = Figure(size, dpi=dpi)
        self.canvas = FigureCanvas(self.figure)
        self.canvas.setParent(self)
        self.subplot = self.figure.add_subplot(111)
        self.show()

    def plot(self, x, y):
        self.subplot.plot(x, y)
        self.canvas.draw()

app = QtWidgets.QApplication([])
timer = QtCore.QTimer()
timer.setInterval(1000)
max_cnt = 5
cnt = 0
mw = None

def on_timeout():
    global cnt, mw
    if mw is not None:
        mw.close()

    if cnt >= max_cnt:
        app.exit()
        return

    cnt += 1
    mw = MatplotlibWidget()
    x = np.linspace(0, 1, 1000)
    y = np.sin(2*np.pi*cnt*x)
    mw.plot(x, y)

timer.timeout.connect(on_timeout)
timer.start()

app.exec() if hasattr(app, 'exec') else app.exec_()

            if QT_API == "PyQt6":
                from PyQt6 import sip
                ptr = int(sip.voidptr(buf))
            else:
                ptr = buf