# Filename: v_layout.py

"""Vertical layout example."""

import sys

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

app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle('QVBoxLayout')
layout = QVBoxLayout()
layout.addWidget(QPushButton('Top'))
layout.addWidget(QPushButton('Center'))
layout.addWidget(QPushButton('Bottom'))
window.setLayout(layout)
window.show()
sys.exit(app.exec_())