Log COM port data to file for Arduino

###################################################
#    Write log from COM port to file for Arduino  #
#    Requires Python 2.7 with PySerial installed  #
#    Install PySerial: pip install pyserial       #
###################################################

import serial

COM_PORT = 'COM7'
COM_BAUD = 9600
LOG_FILE = 'data_log.txt'


def create_port(name, baud, timeout = 1):
    return serial.Serial(
      port=name,
      baudrate=baud,
      bytesize=8,
      parity=serial.PARITY_NONE,
      stopbits=1,
      rtscts=False,
      dsrdtr=False,
      timeout=timeout
      )


if __name__ == '__main__':
    com = create_port(COM_PORT, COM_BAUD)
    print "Logging started"
    with open(LOG_FILE, "a") as log:
        while True:
            try:
                line = com.readline().strip()
                if len(line):
                    print(line)
                    log.write(line + "\r\n")
                    log.flush()
            except:
                break
    print("Logging stopped\r\n")