Display CPU and Virtual Memory in Realtime with PyQt6 and Matplotlib

 This demo program shows how to display in real time the CPU usage and Virtual Memory Usage in % using a donut shape graph from matplotlib.

The output:

The Code:

1 159

import sys import psutil import os from PyQt6.QtWidgets import QApplication, QWidget, QLabel from PyQt6.QtGui import QFont from PyQt6.QtCore import QTimer, QTime, Qt from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg from matplotlib.figure import Figure from matplotlib.patches import Circle i = 5 d = 95 class MplCanvas(FigureCanvasQTAgg): def __init__(self, parent=None, width=5, height=4, dpi=100): super(MplCanvas, self).__init__(Figure(figsize=(width, height), dpi=dpi)) self.axes = self.figure.add_subplot(111) self.setParent(parent) class MplWidget(QWidget): def __init__(self, parent=None): global i global d QWidget.__init__(self, parent) self.canvas = MplCanvas(self) self.canvas1 = MplCanvas(self) d = 100 - i labels = ["a", "b"] data = [d, i] #colors = ["#f2f2f2", "#ff9999"] colors = ["#f2f2f2", "blue"] self.canvas.axes.pie( data, colors=colors, startangle=90, pctdistance=0.85 ) self.canvas1.axes.pie( data, colors=colors, startangle=90, pctdistance=0.85 ) centre_circle = Circle((0, 0), 0.70, fc="white") self.canvas.axes.add_artist(centre_circle) self.canvas.axes.axis("equal") self.canvas.figure.tight_layout() self.canvas.setGeometry(75,75,100,100) self.canvas.draw() centre_circle1 = Circle((0, 0), 0.70, fc="white") self.canvas1.axes.add_artist(centre_circle1) self.canvas1.axes.axis("equal") self.canvas1.figure.tight_layout() self.canvas1.setGeometry(200,75,100,100) self.canvas1.draw() fnt = QFont('Open Sans', 11, QFont.Weight.Bold) fnt1 = QFont('Open Sans', 9) self.lbl = QLabel(self) self.lbl.setAlignment(Qt.AlignmentFlag.AlignCenter) self.lbl.setFont(fnt) self.lbl.setGeometry(78,110,100, 30) self.lbl1 = QLabel(self) self.lbl1.setAlignment(Qt.AlignmentFlag.AlignCenter) self.lbl1.setFont(fnt1) self.lbl1.setGeometry(78,50,100, 30) self.lbl1.setText('CPU Usage') self.lbl2 = QLabel(self) self.lbl2.setAlignment(Qt.AlignmentFlag.AlignCenter) self.lbl2.setFont(fnt) self.lbl2.setGeometry(200,110,100, 30) self.lbl3 = QLabel(self) self.lbl3.setAlignment(Qt.AlignmentFlag.AlignCenter) self.lbl3.setFont(fnt1) self.lbl3.setGeometry(200,50,100, 30) self.lbl3.setText('Virtual Mem Usage') timer = QTimer(self) timer.timeout.connect(self.showTime) timer.start(10000) # update every second self.setGeometry(50,75,400,250) self.setWindowTitle('Post 29') self.showTime() def showTime(self): global i global d #currentTime = QTime.currentTime() i = psutil.cpu_percent() #displayTxt = currentTime.toString('hh:mm:ss') self.lbl.setText(str(i) + '%') d = 100 - i labels = ["a", "b"] data = [d, i] colors = ["#f2f2f2", "blue"] self.canvas.axes.pie( data, colors=colors, startangle=90, pctdistance=1 ) colors = ["#f2f2f2", "green"] centre_circle = Circle((0, 0), 0.85, fc="white") self.canvas.axes.add_artist(centre_circle) self.canvas.axes.axis("equal") self.canvas.figure.tight_layout() self.canvas.setGeometry(75,75,100,100) self.canvas.draw() i = psutil.virtual_memory().available * 100 / psutil.virtual_memory().total self.lbl2.setText(str(round(i,2)) + '%') d = 100 - i data = [d, i] self.canvas1.axes.pie( data, colors=colors, startangle=90, pctdistance=1 ) centre_circle1 = Circle((0, 0), 0.85, fc="white") self.canvas1.axes.add_artist(centre_circle1) self.canvas1.axes.axis("equal") self.canvas1.figure.tight_layout() self.canvas1.setGeometry(200,75,100,100) self.canvas1.draw() #self.update i = i + 5 def main(): app = QApplication(sys.argv) widget = MplWidget() widget.show() sys.exit(app.exec()) if __name__ == "__main__": main()