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class MyLabel(QLabel):    def __init__(self, text, para):        super().__init__(text, para)    def _set_color(self, col):        self.setAutoFillBackground(True)        palette = self.palette()        palette.setColor(self.backgroundRole(), col)        self.setPalette(palette)    color = pyqtProperty(QColor, fset=_set_color)

#!/usr/bin/python3# -*- coding: utf-8 -*-"""PyQt5 Animation tutorialThis program animates the color of awidget with QPropertyAnimation.Author: Seshigure 401219180@qq.comLast edited: 2018.03.02"""from PyQt5.QtWidgets import *from PyQt5.QtGui import *from PyQt5.QtCore import *class MyLabel(QLabel):    def __init__(self, text, para):        super().__init__(text, para)    def _set_color(self, col):        self.setAutoFillBackground(True)        palette = self.palette()        palette.setColor(self.backgroundRole(), col)        self.setPalette(palette)    color = pyqtProperty(QColor, fset=_set_color)class Example(QWidget):    def __init__(self):        super(Example, self).__init__()        self.initUI()    def initUI(self):        self.button = QPushButton("Start", self)        self.button.clicked.connect(self.doAnim)        self.button.move(30, 30)        self.label = MyLabel("changeColor", self)        self.label._set_color(QColor(255, 50, 50, 50))        self.label.setGeometry(150, 30, 100, 100)        self.setGeometry(300, 300, 380, 300)        self.setWindowTitle('Animation')        self.show()    def doAnim(self):        self.anim = QPropertyAnimation(self.label, b"color")        self.anim.setDuration(3000)        self.anim.setStartValue(QColor(255, 50, 50, 50))  # 粉色         self.anim.setKeyValueAt(0.5, QColor(255, 0, 0, 250))  # 紅色        self.anim.setEndValue(QColor(255, 250, 50, 50))  # 米黃        self.anim.start()if __name__ == "__main__":    app = QApplication([])    ex = Example()    ex.show()    app.exec_()