from PyQt5.QtCore import QRectF
from PyQt5.QtGui import QColor, QPainterPath
from PyQt5.QtWidgets import (
QApplication,
QGraphicsPathItem,
QGraphicsScene,
QGraphicsView,
)
def main():
app = QApplication([])
radius = 20
length = 100
square = QRectF(0, 0, 2 * radius, 2 * radius)
path = QPainterPath()
path.moveTo(radius, 0)
path.arcTo(square, 90, 180)
path.lineTo(length, 2 * radius)
square.moveRight(length + 2 * radius)
path.arcTo(square, -90, 180)
path.lineTo(radius, 0)
item = QGraphicsPathItem()
item.setBrush(QColor("red"))
item.setPen(QColor("green"))
item.setPath(path)
scene = QGraphicsScene()
view = QGraphicsView(scene)
scene.addItem(item)
view.show()
app.exec_()
main()