import sys
from PyQt5.QtWidgets import QWidget, QApplication, QLabel
from PyQt5.QtGui import QPainter, QColor, QPixmap
from PyQt5.QtCore import Qt
import random


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):

        self.setGeometry(300, 300, 300, 300)
        self.setWindowTitle('Координаты')

        self.pixmaps = QPixmap(300, 300)
        self.qp = QPainter(self.pixmaps)


        self.show()

    def mousePressEvent(self, event):
        self.qp.begin(self.pixmaps)
        # self.qp.setPen(QColor(168, 34, 3))
        self.qp.setBrush(QColor(168, 34, 3))
        self.qp.drawEllipse(event.x(), event.y(), 10, 10)
        self.qp.end()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())