Function that generates a stylesheet for styling QPushButton

style_QPushButton.py

import sys
from qtpy.QtWidgets import (
    QApplication,
    QMainWindow,
    QPushButton,
    QFrame,
    QGridLayout,
)


def style_QPushButton(
    border_color: str = "#b0b0b0",
    bg_color: str = "#e0e0e0",
    fg_color: str = "#404040",
    border_width: str = "1px",
    border_radius: str = "4px",
    horizontal_padding: str = "4px",
    vertical_padding: str = "2px",
    state_styles: dict[str, dict[str, str]] = {
        "hover": {
            "border_color": "#404040",
        },
        "pressed": {
            "bg_color": "#b0b0b0",
        },
        "disabled": {
            "border_color": "#b0b0b0",
            "bg_color": "#f0f0f0",
            "fg_color": "#b0b0b0",
        },
        "checked": {
            "border_color": "#2020ff",
            "bg_color": "#e0e0f0",
            "fg_color": "#404080",
        },
        "checked:hover": {
            "border_color": "#404040",
        },
        "checked:pressed": {
            "bg_color": "#b0b0b0",
        },
    },
):

    qss = f"""
        QPushButton {{
            border-width: {border_width};
            border-style: solid;
            border-color: {border_color};
            border-radius: {border_radius};
            background-color: {bg_color};
            color: {fg_color};
            padding: {vertical_padding} {horizontal_padding};
        }}  
        """
    for state, styles in state_styles.items():
        rules = []
        if "border_color" in styles:
            rules.append(f"border-color: {styles['border_color']};")
        if "bg_color" in styles:
            rules.append(f"background-color: {styles['bg_color']};")
        if "fg_color" in styles:
            rules.append(f"color: {styles['fg_color']};")

        if rules:
            rules_str = "\n".join(rules)
            qss += f"""
            QPushButton:{state} {{
                {rules_str}
            }}
        """

    return qss


class Frame(QFrame):
    def __init__(self, parent=None):
        super().__init__(parent)
        layout = QGridLayout()
        layout.setSizeConstraint(QGridLayout.SizeConstraint.SetFixedSize)
        w = QPushButton("Button")
        layout.addWidget(w, 0, 0)
        w = QPushButton("Button disabled")
        w.setDisabled(True)
        layout.addWidget(w, 0, 1)
        w = QPushButton("Checkable Button")
        w.setCheckable(True)
        w.setChecked(True)
        layout.addWidget(w, 1, 0)
        self.setLayout(layout)


def main():
    app = QApplication(sys.argv)
    app.setStyleSheet(style_QPushButton())
    w = QMainWindow()
    w.setMinimumSize(200, 100)
    w.setCentralWidget(Frame(w))
    w.show()
    sys.exit(app.exec())