关于python：需要while True：

Need for while True:

我不明白为什么下面的例子中需要"while true："。

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import os
import sys
import subprocess
import time
from threading import Thread
from Queue import Queue

def worker():
while True:
item = q.get()
do_work(item)
q.task_done()

def do_work(item):
time.sleep(item)
print item

q = Queue()
for i in range(2):
t = Thread(target=worker)
t.daemon = True
t.start()

source = [2,3,1,4,5]

for item in source:
q.put(item)

q.join()