I’m trying to connect from pc to arduino nano. I use python and pyserial library. Here is code:

import serial.tools.list_ports

ports = serial.tools.list_ports.comports()
serialInst = serial.Serial()
portsList = []

for one in ports:
    portsList.append(str(one))
    print(str(one))

com = input("Select Com Port for Arduino #: ")

for i in range(len(portsList)):
    if portsList[i].startswith("COM" + str(com)):
        use = "COM" + str(com)
        print(use)

serialInst.baudrate = 9600
serialInst.port = use
serialInst.open()

while True:
    command = input("Arduino Command (ON/OFF/exit): ")
    serialInst.write(command.encode('utf-8'))

    if command == 'exit':
        exit()

This code should turn on/off light when received command from computer.

But it raises that acces denied:

Traceback (most recent call last):
  File "c:UsersUserDesktopprogrammingarduinoSerial example.py", line 20, in <module>
    serialInst.open()
  File "C:UsersUserAppDataLocalProgramsPythonPython312Libsite-packagesserialserialwin32.py", line 64, in open
    raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port 'COM5': PermissionError(13, 'Отказано в доступе.', None, 5)

Why does it happens? i tried to run this file with administrator rights but it still outputs same error, maybe i should use other libraries? Thanks.
Info: i use x64 Windows 10, arduino attached to COM5