pyserial non-block read to stdout

mserial.py

#!/usr/bin/python

import serial
import threading

port = '/dev/ttyUSB0'
baud = 9600

serial_port = serial.Serial(port, baud, timeout=120)

def handle_data(data):
    if len(data):
        print(data)

def read_from_port(ser):
    connected = False
    while not connected:
        #serin = ser.read()
        connected = True

        while True:
           reading = ser.readline().decode(errors='replace')
           handle_data(reading)

thread = threading.Thread(target=read_from_port, args=(serial_port,))
thread.start()