import sys

from PyQt6.QtWidgets import QApplication, QMainWindow, QDockWidget, QLabel, QTextEdit
from PyQt6.QtCore import Qt


class DockWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(DockWindow, self).__init__(*args, **kwargs)

        self.dock_1 = QDockWidget("Dock1", self)
        self.dock_1.layout().addWidget(QLabel("dock1"))

        self.dock_2 = QDockWidget("Dock2", self)
        self.dock_2.layout().addWidget(QLabel("dock2"))

        self.dock_3 = QDockWidget("Dock3", self)
        self.dock_3.layout().addWidget(QLabel("dock3"))

        self.setCentralWidget(QTextEdit())
        self.addDockWidget(Qt.DockWidgetArea.RightDockWidgetArea, self.dock_1)
        self.addDockWidget(Qt.DockWidgetArea.LeftDockWidgetArea, self.dock_2)
        self.addDockWidget(Qt.DockWidgetArea.LeftDockWidgetArea, self.dock_3)


if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = DockWindow()
    window.show()

    app.exec()