from pynput.keyboard import Key, Listener
import serial
port=serial.Serial('com6',9600)
def tus_basildi(tus):
if tus=="S":
port.write(b's')
def tus_salindi(tus):
print('{0} release'.format(tus))
with Listener(on_press=tus_basildi, on_release=tus_salindi) as listener:
listener.join()