6.py

import os
def screen_clear():
   # for mac and linux(here, os.name is 'posix')
   if os.name == 'posix':
      _ = os.system('clear')
   else:
      # for windows platform
      _ = os.system('cls')

screen_clear()

from threading import Thread, Condition
import time
import random

queue = []
MAX_NUM = 10
condition = Condition()

class ProducerThread(Thread):
    def run(self):
        nums = range(5)
        global queue
        while True:
            condition.acquire()
            if len(queue) == MAX_NUM:
                print "Queue full, producer is waiting"
                condition.wait()
                print "Space in queue, Consumer notified the producer"
            num = random.choice(nums)
            queue.append(num)
            print "Produced", num
            condition.notify()
            condition.release()
            time.sleep(random.random())


class ConsumerThread(Thread):
    def run(self):
        global queue
        while True:
            condition.acquire()
            if not queue:
                print "Nothing in queue, consumer is waiting"
                condition.wait()
                print "Producer added something to queue and notified the consumer"
            num = queue.pop(0)
            print "Consumed", num
            condition.notify()
            condition.release()
            time.sleep(random.random())


ProducerThread().start()
ConsumerThread().start()