垂直布局和水平布局的参数调用情况是一致的

VBoxLayout.py 

"""
垂直盒布局(QVBoxLayout)
"""

import sys, math
from PyQt5.QtWidgets import *


class VBoxLayout(QWidget):
    def __init__(self):
        super(VBoxLayout, self).__init__()
        self.setWindowTitle("水平盒布局")

        hlayout = QVBoxLayout()
        hlayout.addWidget(QPushButton('按钮1'))
        hlayout.addWidget(QPushButton('按钮2'))
        hlayout.addWidget(QPushButton('按钮3'))
        hlayout.addWidget(QPushButton('按钮4'))
        hlayout.addWidget(QPushButton('按钮5'))

        #设置按钮的间距
        hlayout.setSpacing(20)
        self.setLayout(hlayout)


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

    main = VBoxLayout()
    main.show()

    sys.exit(app.exec_())