How to scale background image to cover MainWindow in PyQt5 - qt5

Question

I trying to learn PyQt5 so it might a noobie question, but I search a lot and I couldn't find a solution.
I wrinting a sample code showing a countdow to a defined datetime and now it looks like in the image below:
I need to resize the image to cover the app, atm I have a window 300x200 and background image 2400x1800.
I also need the background to resize on MainWindow resize. At first glance css property background-size is not supported, border-image would strech the image.
OS: Windows 7-10 (not a choise)
Python: 3.4.3
PyQt: 5.5
Current code (not working)
from PyQt5 import QtWidgets, QtGui
from PyQt5.QtCore import QObject, pyqtSignal, QTimer
import design
import sys
from datetime import datetime, timedelta
# UI base class is inherited from design.Ui_MainWindow
class Counter(QtWidgets.QMainWindow, design.Ui_MainWindow):
def __init__(self):
super(self.__class__, self).__init__()
self.setupUi(self)
# applying background image
self.background = QtGui.QPixmap("./assets/img/trecime.jpg")
palette = QtGui.QPalette()
palette.setBrush(QtGui.QPalette.Background,QtGui.QBrush(self.background).scale(self.size()))
self.MainWindow.setPalette(palette)
# custom colors for QLCDWidgets
lcdPalette = self.dayCount.palette()
lcdPalette.setColor(lcdPalette.WindowText, QtGui.QColor(255,0,0, 200))
lcdPalette.setColor(lcdPalette.Background, QtGui.QColor(0, 0, 0, 0))
lcdPalette.setColor(lcdPalette.Light, QtGui.QColor(200, 0, 0, 120))
lcdPalette.setColor(lcdPalette.Dark, QtGui.QColor(100, 0, 0, 150))
self.dayCount.setPalette(lcdPalette)
lcdPalette.setColor(lcdPalette.WindowText, QtGui.QColor(255,255,255, 200))
lcdPalette.setColor(lcdPalette.Light, QtGui.QColor(200, 0, 0, 0))
lcdPalette.setColor(lcdPalette.Dark, QtGui.QColor(200, 0, 0, 0))
self.timeCount.setPalette(lcdPalette)
# init Qtimer
self.timer = QTimer()
self.timer.timeout.connect(self.update_timer)
self.timer.start(200)
# config final date
self.finalDatetime = datetime(2016, 11, 30, 14, 00)
def resizeEvent(self, resizeEvent):
print('resized')
def update_timer(self):
currentDatetime = datetime.today()
delta = self.finalDatetime - currentDatetime
(days, hours, minutes) = days_hours_minutes(delta)
self.dayCount.display(days)
# blinking colon
separator = ":" if delta.microseconds < 799999 else ' '
self.timeCount.display('%02d%s%02d' % (hours, separator, minutes))
def days_hours_minutes(td):
return td.days, td.seconds//3600, (td.seconds//60)%60
def main():
app = QtWidgets.QApplication(sys.argv)
counter = Counter()
counter.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()

Answer 1

pyqt style sheet can be used for this resizing
try
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *
class MainWindow(QMainWindow):
def __init__(self,MainWindow):
super().__init__()
self.centralWidget = QWidget()
self.setCentralWidget(self.centralWidget)
MainWindow.setObjectName("MainWindow")
self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralWidget)
self.horizontalLayout_2.setContentsMargins(11, 11, 11, 11)
self.horizontalLayout_2.setSpacing(6)
self.horizontalLayout_2.setObjectName("horizontalLayout_2")
self.horizontalLayout = QtWidgets.QHBoxLayout()
self.horizontalLayout.setSpacing(6)
self.horizontalLayout.setObjectName("horizontalLayout")
self.start_button = QtWidgets.QPushButton(self.centralWidget)
self.start_button.setObjectName("start_button")
self.horizontalLayout.addWidget(self.start_button)
self.stop_button = QtWidgets.QPushButton(self.centralWidget)
self.stop_button.setObjectName("stop_button")
self.horizontalLayout.addWidget(self.stop_button)
self.horizontalLayout_2.addLayout(self.horizontalLayout)
MainWindow.setCentralWidget(self.centralWidget)
self.menuBar = QtWidgets.QMenuBar(MainWindow)
self.menuBar.setGeometry(QtCore.QRect(0, 0, 400, 26))
self.menuBar.setObjectName("menuBar")
MainWindow.setMenuBar(self.menuBar)
self.mainToolBar = QtWidgets.QToolBar(MainWindow)
self.mainToolBar.setObjectName("mainToolBar")
MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.mainToolBar)
self.statusBar = QtWidgets.QStatusBar(MainWindow)
self.statusBar.setObjectName("statusBar")
MainWindow.setStatusBar(self.statusBar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.start_button.setText(_translate("MainWindow", "Start"))
self.stop_button.setText(_translate("MainWindow", "Stop"))
stylesheet = """
MainWindow {
border-image: url("The_Project_logo.png");
background-repeat: no-repeat;
background-position: center;
}
"""
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
app.setStyleSheet(stylesheet) # <---
window = MainWindow()
window.resize(640, 640)
window.show()
sys.exit(app.exec_())