qColorButton, use to configure colors, shows a color on itself, show HEX/RGBA Values on Tooltip, and opens QColorDialog when clicked.

qcolorbutton.py

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


"""qColorButton, use to configure colors, opens QColorDialog when clicked."""


from PyQt5.QtCore import pyqtSignal

from PyQt5.QtGui import QColor, QPixmap, QIcon

from PyQt5.QtWidgets import QColorDialog, QToolButton


class qColorButton(QToolButton):

    """Button, which is used for configuring colors."""

    colorChanged = pyqtSignal(QColor)  # Emit after current color has changed

    def __init__(self, parent=None, color="#000", *args):
        """Init class of qColorButton."""
        super(qColorButton, self).__init__(parent=None, *args)
        self.setColor(color if isinstance(color, QColor) else QColor())
        self.color, self.get_color = color, self.getColor
        self.clicked.connect(self._onClicked)

    def getColor(self):
        """Return current selected color."""
        return self.color

    def setColor(self, color):
        """Set a Color. Update button icon."""
        self.color = color
        c = self.color
        texts = (
            "HEXA #%02x%02x%02x%02x" % (
                c.red(), c.green(), c.blue(), c.alpha()),
            "RGBA %d, %d, %d, %d" % (
                c.red(), c.green(), c.blue(), c.alpha()))
        self.setText(texts[0])
        self.setToolTip("<b>" + "\n".join(texts))
        pixmap = QPixmap(self.iconSize())
        pixmap.fill(self.color)
        self.setIcon(QIcon(pixmap))
        self.colorChanged.emit(self.color)

    def _onClicked(self):
        """Button has been clicked. Show dialog and update color."""
        color = QColorDialog.getColor()
        if color.isValid():
            self.setColor(color)


if __name__ in "__main__":
    from PyQt5.QtWidgets import QApplication
    app = QApplication([])
    numberPad = qColorButton(None, "#bebe")
    numberPad.show()
    exit(app.exec_())