#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import PyQt4.Qt as Qt

class BarPlotMainWindow(Qt.QMainWindow):
    def __init__(self, parent=None):
        Qt.QMainWindow.__init__(self, parent)
        fr = Qt.QFrame()
        button1 = Qt.QPushButton(u'Кнопка 1')
        buttonLayout = Qt.QVBoxLayout()
        buttonLayout.addWidget(button1)
        buttonLayout.addStretch()

        fr.setLayout(Qt.QHBoxLayout())
        fr.layout().addLayout(buttonLayout)
        widget1 = Qt.QWidget()
        fr.layout().addWidget(widget1)
        self.setCentralWidget(fr)

app = Qt.QApplication(sys.argv)
demo = BarPlotMainWindow()
demo.resize(1000, 500)
demo.show()

sys.exit(app.exec_())

demo.setMinimumSize(100, 100)
demo.setMaximumSize(100, 10000000)

forma=QtGui.QFrame()
kompanovka=QtGui.QVBoxLayout()
forma.setLayout(kompanovka)

forma.setMinimumSize(100, 100)
forma.setMaximumSize(100, 10000000)