import sys from PyQt5.QtWidgets
import QPushButton, QApplication, QWidget
class aWinForm(QWidget):
   def __init__(self, parent = None):
      super(aWinForm, self).__init__(parent)
      self.setGeometry(300, 300, 350, 350)
      self.setWindowTitle("Close Window")
      quit = QPushButton("close", self)
      quit.setGeometry(10, 10, 60, 35)
      quit.setStyleSheet("background-color:yellow")
      quit.clicked.connect(self.close)
if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = aWinForm()
   win.show()
   sys.exit(app.exec_())