PyQt5 'Fusion' - theme

QT5DarkGreyTheme.py

import sys

# Needed for the example
from PyQt5.QtWidgets import QWidget, QApplication

# Needed for the theme
from PyQt5 import QtCore, QtGui

def setTheme(app):
    app.setStyle('Fusion')
    palette = QtGui.QPalette()
    palette.setColor(QtGui.QPalette.Window, QtGui.QColor(53, 53, 53))
    palette.setColor(QtGui.QPalette.WindowText, QtGui.QColor(180, 180, 180))
    palette.setColor(QtGui.QPalette.Base, QtGui.QColor(40, 40, 40))
    palette.setColor(QtGui.QPalette.AlternateBase, QtGui.QColor(53, 53, 53))
    palette.setColor(QtGui.QPalette.ToolTipBase, QtCore.Qt.darkGray)
    palette.setColor(QtGui.QPalette.ToolTipText, QtCore.Qt.darkGray)
    palette.setColor(QtGui.QPalette.Text, QtGui.QColor(180, 180, 180))
    palette.setColor(QtGui.QPalette.Button, QtGui.QColor(53, 53, 53))
    palette.setColor(QtGui.QPalette.ButtonText, QtGui.QColor(180, 180, 180))
    palette.setColor(QtGui.QPalette.BrightText, QtCore.Qt.red)
    palette.setColor(QtGui.QPalette.Highlight, QtGui.QColor(60, 60, 60).lighter())
    palette.setColor(QtGui.QPalette.HighlightedText, QtGui.QColor(180, 180, 180))
    app.setPalette(palette)


def main():
    app = QApplication(sys.argv)
    window = QWidget()
    setTheme(app)
    window.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()
    
    
    
    

Just use the setTheme(app) function and give it the QApplication as argument (See line 30).