in my code I can connect port but ı want to add disconnect port how can ı do this .
–> when ı try disconnect application shutdown. I want disconnect port and connect again
this is pyqt application for embedded Card ı need to try connection spi uart leds thank you.
This is new beginner code sorry for bad things.

# This Python file uses the following encoding: utf-8
import sys

from PyQt6.QtWidgets import QApplication, QWidget, QStackedWidget
import serial
import serial.tools.list_ports
from datakey import *

from ui_form import Ui_Widget
ports = serial.tools.list_ports.comports()
ali =0
for port in ports:
    print(port.description,port.device)

class Widget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_Widget()
        self.ui.setupUi(self)  
        self.port_add()
        self.ui.connectPushButton.clicked.connect(self.on_connect)
        #self.ui.connectPushButton.clicked.connect(ali=1)
        

    def port_add(self):
        for port in ports:
            self.ui.PortcomboBox.addItem(port.device)
    
    def on_connect(self):
        selected_item = self.ui.PortcomboBox.currentText()
        
        ser=serial.Serial(port = selected_item , baudrate = 115200 , parity = serial.PARITY_NONE,timeout=1000)
        if ser.is_open == True:
            self.ui.connectPushButton.setText("Connected")
            self.ui.connectPushButton.setStyleSheet("background-color: green;")
            print("baglandi adamim")
            self.ui.connectPushButton.clicked.connect    
            self.worker =  Worker(ser)
            self.thread = QThread()
            self.worker.moveToThread(self.thread)
            self.thread.started.connect(self.worker.work)
            self.worker.finished.connect(self.thread.quit)
            self.worker.finished.connect(self.worker.deleteLater)
            self.thread.finished.connect(self.thread.deleteLater)
            self.thread.start()
           
  

if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = Widget()
    widget.show()
    sys.exit(app.exec())

sdasda