Python-сообщество

 import sys
from PyQt5.QtWidgets import QApplication, QWidget, QFrame, QPushButton, QGridLayout, QSplitter
from PyQt5.QtGui import QPixmap, QColor, QPainter
from PyQt5.QtCore import Qt
class Splitter(QSplitter):
    def __init__(self, napr, frame):
        super().__init__(napr)
        self.frame = frame
    def resizeEvent(self, e):
        self.frame.setSize(self.width(), self.height())
class Frame(QFrame):
    def __init__(self, parent):
        super().__init__(parent)
        self.parent = parent
        self.initUI()
    def initUI(self):
        self.pix = QPixmap(300,300)
        self.pix.fill(QColor('white'))
    def paintEvent(self, e):
        p = QPainter(self)
        p.drawPixmap(0,0, self.pix)
    def mousePressEvent(self, e):
        if e.button() == Qt.LeftButton:
            self.goEllipse(e)
    def mouseMoveEvent(self, e):
        self.goEllipse(e)
    def goEllipse(self, e):
        p = QPainter(self.pix)
        p.drawEllipse(e.pos(), 10, 10)
        self.update()
    def setSize(self, w, h):
        self.setSize(w,h)
        self.pix = QPixmap(w,h)
class W(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.resize(400,800)
        self.frame = QFrame(self)
        self.splitter = Splitter(Qt.Horizontal, self.frame)
        self.splitter.addWidget(self.splitter)
        layout = QGridLayout()
        layout.addWidget(self.splitter, 0,0)
        self.setLayout(self.layout)
        self.show()
app = QApplication(sys.argv)
w=W()
sys.exit(app.exec_())

 import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import Qt
    
class Frame(QFrame):
    def __init__(self,parent=None):
        QFrame.__init__(self,parent)
        self.resize(400,400)
        self.setStyleSheet('QWidget {Background-color: %s}'% QColor('white').name())
        self.pix = QPixmap()
    def paintEvent(self, e):
        p = QPainter(self)
        p.drawPixmap(0,0,self.pix)
    def mouseMoveEvent(self, e):
        p = QPainter(self.pix)
        p.setBrush(QColor('red'))
        p.drawEllipse(e.pos(), 5, 5)
        self.update()
    def resizeEvent(self,e):
        self.pix = QPixmap(self.size())
        self.pix.fill(QColor(0,0,0,0))
    
class W(QWidget):
    def __init__(self,parent=None):
        QWidget.__init__(self,parent)
        self.frame = Frame()
        self.lbl = QLabel('Label')
        splitter = QSplitter(Qt.Vertical)
        splitter.addWidget(self.frame)
        splitter.addWidget(self.lbl)
        grid =  QGridLayout(self)
        grid.addWidget(splitter,0,0)
        
app = QApplication(sys.argv)
w = W()
w.resize(500,500)
w.show()
sys.exit(app.exec_())