Write lines from a serial device to stdout

serialwriter.py

#!/usr/bin/env python
# Writes lines from a serial device to stdout. Use Ctrl+C to exit.
# Requires pySerial
#
# Usage:
# python serialwriter.py DEVICE [BAUD_RATE]
#
# Example:
# $ python serialwriter.py /dev/serial.device 115200

import sys
import serial

serial_port = sys.argv[1]

if len(sys.argv) < 3:
  baud_rate = 115200
else:
  baud_rate = sys.argv[2]

ser = serial.Serial(serial_port, baud_rate)

try:
  while True:
    line = ser.readline()
    line = line.decode("utf-8")
    sys.stdout.write(line)
    sys.stdout.flush()

except KeyboardInterrupt:
  sys.exit(0)