pyqt/basic/layout_4.py

import sys

from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QHBoxLayout, QVBoxLayout, QGridLayout

from layout_colorwidget import Color


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()

        self.setWindowTitle("My App")

        layout1 = QHBoxLayout()
        layout2 = QVBoxLayout()
        layout3 = QVBoxLayout()
        layout4 = QGridLayout()

        layout2.addWidget(Color("red"))
        layout2.addWidget(Color("green"))
        layout2.addWidget(Color("blue"))

        layout1.addLayout(layout2)
        layout1.addWidget(Color("green"))

        layout3.addWidget(Color("red"))
        layout3.addWidget(Color("purple"))

        layout1.addLayout(layout3)

        layout4.addWidget(Color("red"), 0, 0)
        layout4.addWidget(Color("green"), 1, 0)
        layout4.addWidget(Color("blue"), 1, 1)
        layout4.addWidget(Color("purple"), 2, 1)

        layout1.addLayout(layout4)

        layout1.setContentsMargins(10, 5, 10, 5)

        widget = QWidget()
        widget.setLayout(layout1)
        self.setCentralWidget(widget)


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