https://github.com/hubenchang0515/QtTheme

Qt Theme is a pure qss project that can easily improve the style of existing projects.

Supports C++, PyQt5, PyQt6, PySide2, PySide6, and is published on GitHub Pages as WebAssembly.



Here is a demo of its use on Python, first install it:

pip install QtTheme

Alternatively, without installing QtTheme, you can export a single-style qrc resource package through the online website. Use RCC to add it to your project?
Let AI write an UI for me as an style example:

Qt Code: 
  1. # Generated by ChatGPT
  2. import sys
  3. from PyQt5.QtCore import Qt
  5.  
  6. class MyWindow(QDialog):
  7.     def __init__(self):
  8.         super().__init__()
  9.         self.setWindowTitle("PyQt5 Widgets Example")
  10.         self.setGeometry(100, 100, 400, 300)
  11.  
  12.         # Create layouts
  13.         main_layout = QVBoxLayout()  # Vertical layout for the whole window
  14.         form_layout = QVBoxLayout()  # Layout for the form
  15.  
  16.         # Add a QLabel and QLineEdit (text input)
  17.         self.label = QLabel("Enter your name:", self)
  18.         self.text_input = QLineEdit(self)
  19.  
  20.         form_layout.addWidget(self.label)
  21.         form_layout.addWidget(self.text_input)
  22.  
  23.         # Add a QComboBox (dropdown)
  24.         self.combo_label = QLabel("Select your favorite color:", self)
  25.         self.combo_box = QComboBox(self)
  26.         self.combo_box.addItems(["Red", "Green", "Blue", "Yellow"])
  27.  
  28.         form_layout.addWidget(self.combo_label)
  29.         form_layout.addWidget(self.combo_box)
  30.  
  31.         # Add a QCheckBox
  32.         self.check_box = QCheckBox("I agree to the terms and conditions", self)
  33.  
  34.         form_layout.addWidget(self.check_box)
  35.  
  36.         # Add a QRadioButton (grouped)
  37.         self.radio_label = QLabel("Choose your preferred language:", self)
  38.         self.radio_button_english = QRadioButton("English", self)
  39.         self.radio_button_french = QRadioButton("French", self)
  40.         self.radio_button_spanish = QRadioButton("Spanish", self)
  41.  
  42.         # Add the radio buttons to a horizontal layout
  43.         radio_layout = QHBoxLayout()
  44.         radio_layout.addWidget(self.radio_button_english)
  45.         radio_layout.addWidget(self.radio_button_french)
  46.         radio_layout.addWidget(self.radio_button_spanish)
  47.  
  48.         form_layout.addWidget(self.radio_label)
  49.         form_layout.addLayout(radio_layout)
  50.  
  51.         # Add a QPushButton
  52.         self.submit_button = QPushButton("Submit", self)
  53.         self.submit_button.clicked.connect(self.on_button_click)
  54.  
  55.         # Add an exit button
  56.         self.exit_button = QPushButton("Exit", self)
  57.  
  58.         button_layout = QHBoxLayout()
  59.         button_layout.addWidget(self.submit_button)
  60.         button_layout.addWidget(self.exit_button)
  61.  
  62.         # Add the form layout to the main layout
  63.         main_layout.addLayout(form_layout)
  64.         main_layout.addLayout(button_layout)
  65.  
  66.         # Set the window layout
  67.         self.setLayout(main_layout)
  68.  
  69.     def on_button_click(self):
  70.         name = self.text_input.text()
  71.         favorite_color = self.combo_box.currentText()
  72.         is_agree = self.check_box.isChecked()
  73.         preferred_language = "None"
  74.  
  75.         if self.radio_button_english.isChecked():
  76.             preferred_language = "English"
  77.         elif self.radio_button_french.isChecked():
  78.             preferred_language = "French"
  79.         elif self.radio_button_spanish.isChecked():
  80.             preferred_language = "Spanish"
  81.  
  82.         print(f"Name: {name}")
  83.         print(f"Favorite Color: {favorite_color}")
  84.         print(f"Agreed to Terms: {is_agree}")
  85.         print(f"Preferred Language: {preferred_language}")
  86.  
  87. if __name__ == "__main__":
  88.     app = QApplication(sys.argv)
  89.     window = MyWindow()
  90.     window.show()
  91.     sys.exit(app.exec_())
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try to run it:



Import QtTheme, then read and set the style for the root widget through the Qt resource system:

Qt Code: 
  1. import QtTheme.PyQt5
  2. from PyQt5.QtCore import QFile
  3.  
  4. class MyWindow(QDialog):
  5.     def __init__(self):
  6.         # ...
  7.         qss = QFile(":/QtTheme/theme/Flat/Dark/Blue/Pink.qss")
  8.         qss.open(QFile.OpenModeFlag.ReadOnly)
  9.         self.setStyleSheet(qss.readAll().data().decode())
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Finally, set the color for the widgets through QWidget.setProperty as needed:

Qt Code: 
  1. class MyWindow(QDialog):
  2.     def __init__(self):
  3.         # ...
  4.         qss = QFile(":/QtTheme/theme/Flat/Dark/Blue/Pink.qss")
  5.         qss.open(QFile.OpenModeFlag.ReadOnly)
  6.         self.setStyleSheet(qss.readAll().data().decode())
  7.  
  8.         self.submit_button.setProperty("Color", "Primary")
  9.         self.exit_button.setProperty("Color", "Danger")
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