Unable to plot

[ALI-]

from PyQt5.QtWidgets import *

from matplotlib.backends.backend_qt5agg import FigureCanvasAgg as FigureCanvas

from matplotlib.figure import Figure

class MplWidget(QWidget):

def __init__(self, parent=None):
    QWidget.__init__(self, parent)

    self.canvas = FigureCanvas(Figure())

    vertical_layout = QVBoxLayout()
    vertical_layout.addWidget(self.canvas)

    self.canvas.axes = self.canvas.figure.add_subplot(111)
    self.setLayout(vertical_layout)

from PyQt5.QtWidgets import *
from PyQt5.uic import loadUi

from matplotlib.backends.backend_qt5agg import (NavigationToolbar2QT as NavigationToolbar)

import numpy as np
import random

class MatplotlibWidget(QMainWindow):

def __init__(self):
    QMainWindow.__init__(self)

    loadUi(r"C:\Users\Mehidiali Agharia\PycharmProjects\pythonProject\GUI_1.ui", self)

    self.setWindowTitle("PyQt5 & Matplotlib Example GUI")

    self.pushButton.clicked.connect(self.update_graph)

    self.addToolBar(NavigationToolbar(self.MplWidget.canvas, self))

def update_graph(self):
    fs = 500
    f = random.randint(1, 100)
    ts = 1 / fs
    length_of_signal = 100
    t = np.linspace(0, 1, length_of_signal)

    cosinus_signal = np.cos(2 * np.pi * f * t)
    sinus_signal = np.sin(2 * np.pi * f * t)

    self.MplWidget.canvas.axes.clear()
    self.MplWidget.canvas.axes.plot(t, cosinus_signal)
    self.MplWidget.canvas.axes.plot(t, sinus_signal)
    self.MplWidget.canvas.axes.legend(('cosinus', 'sinus'), loc='upper right')
    self.MplWidget.canvas.axes.set_title('Cosinus - Sinus Signal')
    self.MplWidget.canvas.draw()

app = QApplication([])
window = MatplotlibWidget()
window.show()
app.exec_()

[jsulm]

@ALI

1. Please format your code properly!
2. Ask a clear question and describe what is not working (we are not mind readers)

[ALI-]

'MatplotlibWidget' object has no attribute 'MplWidget'

this type of error is coming
can you please help me ?

[jsulm]

@ALI You asked exact same question in another thread and got an answer already.
Please don't double post!

The error message is quite clear: your MatplotlibWidget has no member called MplWidget. Why should it have such a member?

[JonB]

@ALI
What is the point of you asking this question in another post, I answered it there, now you ask here... ? This is why double-posting is unhelpful.