Qt5 Dark Fusion Palette for Python

dark_fusion.py

qApp.setStyle("Fusion")

dark_palette = QPalette()

dark_palette.setColor(QPalette.Window, QColor(53, 53, 53))
dark_palette.setColor(QPalette.WindowText, Qt.white)
dark_palette.setColor(QPalette.Base, QColor(25, 25, 25))
dark_palette.setColor(QPalette.AlternateBase, QColor(53, 53, 53))
dark_palette.setColor(QPalette.ToolTipBase, Qt.white)
dark_palette.setColor(QPalette.ToolTipText, Qt.white)
dark_palette.setColor(QPalette.Text, Qt.white)
dark_palette.setColor(QPalette.Button, QColor(53, 53, 53))
dark_palette.setColor(QPalette.ButtonText, Qt.white)
dark_palette.setColor(QPalette.BrightText, Qt.red)
dark_palette.setColor(QPalette.Link, QColor(42, 130, 218))
dark_palette.setColor(QPalette.Highlight, QColor(42, 130, 218))
dark_palette.setColor(QPalette.HighlightedText, Qt.black)

qApp.setPalette(dark_palette)

qApp.setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }")

Put it wherever you have access to you QApplication(). Replace 'qApp' with your object's name and change out all the Qt.colorName calls with a QColor, for example Qt.white becomes QColor(255, 255, 255)

Maybe this would help some people.

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

from PyQt5.QtGui import QPalette, QColor


WHITE =     QColor(255, 255, 255)
BLACK =     QColor(0, 0, 0)
RED =       QColor(255, 0, 0)
PRIMARY =   QColor(53, 53, 53)
SECONDARY = QColor(35, 35, 35)
TERTIARY =  QColor(42, 130, 218)


def css_rgb(color, a=False):
    """Get a CSS `rgb` or `rgba` string from a `QtGui.QColor`."""
    return ("rgba({}, {}, {}, {})" if a else "rgb({}, {}, {})").format(*color.getRgb())


class QDarkPalette(QPalette):
    """Dark palette for a Qt application meant to be used with the Fusion theme."""
    def __init__(self, *__args):
        super().__init__(*__args)

        # Set all the colors based on the constants in globals
        self.setColor(QPalette.Window,          PRIMARY)
        self.setColor(QPalette.WindowText,      WHITE)
        self.setColor(QPalette.Base,            SECONDARY)
        self.setColor(QPalette.AlternateBase,   PRIMARY)
        self.setColor(QPalette.ToolTipBase,     WHITE)
        self.setColor(QPalette.ToolTipText,     WHITE)
        self.setColor(QPalette.Text,            WHITE)
        self.setColor(QPalette.Button,          PRIMARY)
        self.setColor(QPalette.ButtonText,      WHITE)
        self.setColor(QPalette.BrightText,      RED)
        self.setColor(QPalette.Link,            TERTIARY)
        self.setColor(QPalette.Highlight,       TERTIARY)
        self.setColor(QPalette.HighlightedText, BLACK)

    @staticmethod
    def set_stylesheet(app):
        """Static method to set the tooltip stylesheet to a `QtWidgets.QApplication`."""
        app.setStyleSheet("QToolTip {{"
                          "color: {white};"
                          "background-color: {tertiary};"
                          "border: 1px solid {white};"
                          "}}".format(white=css_rgb(WHITE), tertiary=css_rgb(TERTIARY)))

    def set_app(self, app):
        """Set the Fusion theme and this palette to a `QtWidgets.QApplication`."""
        app.setStyle("Fusion")
        app.setPalette(self)
        self.set_stylesheet(app)

Maybe also add for disabled tabs (untested):

palette.setColor(QPalette.Disabled, QPalette.WindowText, Qt.darkGray)

To complete disabled menu (tested):

dark_palette.setColor(QPalette.Disabled, QPalette.Text, QtCore.Qt.darkGray)
dark_palette.setColor(QPalette.Disabled, QPalette.ButtonText, QtCore.Qt.darkGray)

Thanks @hdrpano @0x6a61 for those tips

This is the winning complete combination for my use nice context menus

    dark_palette = QPalette()
    dark_palette.setColor(QPalette.Window, QColor(53, 53, 53))
    dark_palette.setColor(QPalette.WindowText, Qt.white)
    dark_palette.setColor(QPalette.Base, QColor(35, 35, 35))
    dark_palette.setColor(QPalette.AlternateBase, QColor(53, 53, 53))
    dark_palette.setColor(QPalette.ToolTipBase, QColor(25, 25, 25))
    dark_palette.setColor(QPalette.ToolTipText, Qt.white)
    dark_palette.setColor(QPalette.Text, Qt.white)
    dark_palette.setColor(QPalette.Button, QColor(53, 53, 53))
    dark_palette.setColor(QPalette.ButtonText, Qt.white)
    dark_palette.setColor(QPalette.BrightText, Qt.red)
    dark_palette.setColor(QPalette.Link, QColor(42, 130, 218))
    dark_palette.setColor(QPalette.Highlight, QColor(42, 130, 218))
    dark_palette.setColor(QPalette.HighlightedText, QColor(35, 35, 35))
    dark_palette.setColor(QPalette.Active, QPalette.Button, QColor(53, 53, 53))
    dark_palette.setColor(QPalette.Disabled, QPalette.ButtonText, Qt.darkGray)
    dark_palette.setColor(QPalette.Disabled, QPalette.WindowText, Qt.darkGray)
    dark_palette.setColor(QPalette.Disabled, QPalette.Text, Qt.darkGray)
    dark_palette.setColor(QPalette.Disabled, QPalette.Light, QColor(53, 53, 53))

PyQt6:

palette = QPalette()
palette.setColor(QPalette.ColorRole.Window, QColor(53,53,53))
palette.setColor(QPalette.ColorRole.WindowText, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.Base, QColor(42,42,42))
palette.setColor(QPalette.ColorRole.ToolTipBase, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.ToolTipText, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.Dark, QColor(35,35,35))
palette.setColor(QPalette.ColorRole.Shadow, QColor(20,20,20))
palette.setColor(QPalette.ColorRole.AlternateBase, QColor(53, 53, 53))
palette.setColor(QPalette.ColorRole.ToolTipBase, Qt.GlobalColor.black)
palette.setColor(QPalette.ColorRole.ToolTipText, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.Text, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.Button, QColor(53, 53, 53))
palette.setColor(QPalette.ColorRole.ButtonText, Qt.GlobalColor.white)
palette.setColor(QPalette.ColorRole.BrightText, Qt.GlobalColor.red)
palette.setColor(QPalette.ColorRole.Link, QColor(42, 130, 218))
palette.setColor(QPalette.ColorRole.Highlight, QColor(42, 130, 218))
palette.setColor(QPalette.ColorRole.HighlightedText, QColor(127,127,127))
app.setPalette(palette)
app.setStyle("Fusion")