PyQt5--QColorDiaglog

 # -*- coding:utf-8 -*-
 '''
 Created on Sep 17, 2018

 @author: SaShuangYiBing

 Comment:
 '''
 import sys
 from PyQt5.QtGui import QColor
 from PyQt5.QtWidgets import QApplication,QWidget,QColorDialog,QPushButton,QFrame

 class New_test(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         col = QColor(0,0,0)

         btn = QPushButton('Diaglog',self)
         btn.move(20,20)
         btn.clicked.connect(self.showdiaglog)

         self.frm = QFrame(self)
         self.frm.setStyleSheet('QWidget {background-color:%s}' %col.name())
         self.frm.setGeometry(130,22,100,100)
         self.setGeometry(300,300,250,180)
         self.setWindowTitle('Color Diaglog')
         self.show()

     def showdiaglog(self):
         col = QColorDialog.getColor()

         if col.isValid():
             self.frm.setStyleSheet('QWidget {background-color:%s}' %col.name())

 if __name__ == '__main__':
     app = QApplication(sys.argv)
     ex = New_test()
     sys.exit(app.exec_())