python - How do I know who is using my COM port and terminate it -

i trying open serial port using below command , running windowserror(5, 'access denied.') error,how figure out using port , terminate via commandline?

code:

mport serial import serial.tools.list_ports self.ser = serial.serial(self.port, baud_rate, timeout=timeout) ........ 

error:-

could not open port 'com77': windowserror(5, 'access denied.')