pyTouch.py

import serial
from time import sleep
def TouchSerialPort(port, baudrate):
    print("Forcing reset using %dbps open/close on port %s" % (baudrate, port))
    try:
        print("define")
        s = serial.Serial(
            port=port, 
            baudrate = baudrate
            #parity=0,
            #stopbits=1,
            #bytesize=8,
            #timeout=1
        )

        print("DTR")
        s.setDTR(False)
        print("postDTR")
        s.close()
    except:  # pylint: disable=bare-except
        print("Could not touch")
        pass
    sleep(0.4)  # DO NOT REMOVE THAT (required by SAM-BA based boards)

if __name__ == '__main__':
    TouchSerialPort('/dev/ttyACM0', 1200) # '/dev/ttyACM0' '/dev/ttyUSB0'