PyQt5 - Drawing different types of straight lines

The effect is as follows:

The code is as follows:

'''Draw different types of straight lines'''import sys,mathfrom PyQt5.QtWidgets import *from PyQt5.QtGui import *from PyQt5.QtCore import Qtclass DrawMultiLine(QWidget):def __init__(self):super(DrawMultiLine,self).__init__()self.resize(300,300)self.setWindowTitle('Set Pen's style')def paintEvent(self, event):painter = QPainter()painter.begin(self)pen = QPen(Qt.red,3,Qt.SolidLine)painter.setPen(pen)painter.drawLine(20,40,250,40)pen.setStyle(Qt.DashLine)painter.setPen(pen)painter.drawLine(20, 80, 250, 80)pen.setStyle(Qt.DashDotDotLine)painter.setPen(pen)painter.drawLine(20, 120, 250, 120)pen.setStyle(Qt.DotLine)painter.setPen(pen)painter.drawLine(20, 160, 250, 160)pen.setStyle(Qt.DashDotDotLine)painter.setPen(pen)painter.drawLine(20, 200, 250, 200)pen.setStyle(Qt.CustomDashLine)pen.setDashPattern([1,10,5,8])painter.setPen(pen)painter.drawLine(20, 240, 250, 240)size = self.size()painter.end()if __name__ == '__main__':app = QApplication(sys.argv)main = DrawMultiLine()main.show()sys.exit(app.exec_())