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import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 鍒涘缓鍨傜洿甯冨眬瀵硅薄
        layout = QVBoxLayout()

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        button1 = QPushButton('Button 1')
        layout.addWidget(button1)

        button2 = QPushButton('Button 2')
        layout.addWidget(button2)

        button3 = QPushButton('Button 3')
        layout.addWidget(button3)

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        self.setLayout(layout)

        self.setWindowTitle('Vertical Layout')
        self.setGeometry(300, 300, 300, 200)
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MyWidget()
    sys.exit(app.exec_())

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