hallo

from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QGridLayout, QWidget, QCheckBox, QSystemTrayIcon, \

        QSpacerItem, QSizePolicy, QMenu, QAction, QStyle, qApp

from PyQt5.QtCore import QSize

class MainWindow(QMainWindow):

    """

        Сheckbox and system tray icons.

        Will initialize in the constructor.

    """

    check_box = None

    tray_icon = None

    # Override the class constructor

    def __init__(self):

        # Be sure to call the super class method

        QMainWindow.__init__(self)

        self.setMinimumSize(QSize(480, 80))             # Set sizes

        self.setWindowTitle("System Tray Application")  # Set a title

        central_widget = QWidget(self)                  # Create a central widget

        self.setCentralWidget(central_widget)           # Set the central widget

        grid_layout = QGridLayout(self)         # Create a QGridLayout

        central_widget.setLayout(grid_layout)   # Set the layout into the central widget

        grid_layout.addWidget(QLabel("Application, which can minimize to Tray", self), 0, 0)

        # Add a checkbox, which will depend on the behavior of the program when the window is closed

        self.check_box = QCheckBox('Minimize to Tray')

        grid_layout.addWidget(self.check_box, 1, 0)

        grid_layout.addItem(QSpacerItem(0, 0, QSizePolicy.Expanding, QSizePolicy.Expanding), 2, 0)

        # Init QSystemTrayIcon

        self.tray_icon = QSystemTrayIcon(self)

        self.tray_icon.setIcon(self.style().standardIcon(QStyle.SP_ComputerIcon))

        '''

        Define and add steps to work with the system tray icon

        show - show window

        hide - hide window

        exit - exit from application

        '''

        show_action = QAction("Show", self)

        quit_action = QAction("Exit", self)

        hide_action = QAction("Hide", self)

        show_action.triggered.connect(self.show)

        hide_action.triggered.connect(self.hide)

        quit_action.triggered.connect(qApp.quit)

        tray_menu = QMenu()

        tray_menu.addAction(show_action)

        tray_menu.addAction(hide_action)

        tray_menu.addAction(quit_action)

        self.tray_icon.setContextMenu(tray_menu)

        self.tray_icon.show()

        # Override closeEvent, to intercept the window closing event

        # The window will be closed only if there is no check mark in the check box

        def closeEvent(self, event):

            if self.check_box.isChecked():

                event.ignore()

                self.hide()

                self.tray_icon.showMessage(

                    "Tray Program",

                    "Application was minimized to Tray",

                    QSystemTrayIcon.Information,

                    2000

                    )

if __name__ == "__main__":

    import sys

    app = QApplication(sys.argv)

    mw = MainWindow()

    mw.show()

    sys.exit(app.exec())