import threading
import Queue
import time

cola = Queue.Queue()

class worker:
    def __init__(self,cola,ser):
        self.cola = cola
        self.ser = ser

    def read_serial(self,ser):
        while True :
            inp = 'a'
            byte = inp.encode('hex')
            self.cola.put(byte)
            time.sleep(1)

    def go(self):
        th1 = threading.Thread(target=self.read_serial, args=[ser])
        th1.start()

class worker2:
    def __init__(self,cola,):
        self.cola = cola
        self.ser = ser

    def getrx(self,cola):
        while True:
            rx = self.cola.get()
            print str(rx)

    def go2(self):
        th2 = threading.Thread(target=self.getrx, args=[cola])
        th2.start()

ser=None
t = worker(cola,ser)
t.go()
t2 = worker2(cola)
t2.go2()