PyQt programming (transparency window)

qtsample.py

import sys
import random
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
 
class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        self.labels = []

        self.button = QPushButton('exit', self)
        self.button.clicked.connect(self.exit)

        self.horizon = QHBoxLayout()
        self.horizon.addWidget(self.button)
        self.setLayout(self.horizon)

        self.setGeometry(300, 10, 400, 350)
        self.setWindowTitle('QCheckBox')

        self.setAttribute(Qt.WA_TranslucentBackground)
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)

        self.start()

    # timer
    def start(self):
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.timeout)
        self.timer.start(10)

    def stop(self):
        self.timer.stop()

    def timeout(self):
        self.move()
        self.timer.start(10)

    def add_label(self):
        label = QLabel(self)
        label.setText("テスト")
        label.setFont(QFont("Times", 32, QFont.Bold))
        label.move(300, random.randint(0, 300))
        label.show()

        return label

    def move(self):
        lives = []
        for label in self.labels:
            label.move(label.x() - 1, label.y())
            if label.x() < 0:
                label.hide()
                label.deleteLater()
                lives.append(self.add_label())
            else:
                lives.append(label)
        self.labels = lives

        if random.randint(0, 500) < 10:
            self.labels.append(self.add_label())

    def exit(self):
      exit(0)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())