Python实现线程交替打印字符串

import threading
con = threading.Condition()
word = u"12345上山打老虎"def work():
global word
con.acquire()
while True:
print word[0]
word = word[1:]
if len(word) == 0:
break
con.notify()
if len(word) == 1:
break
con.wait()
con.release()t1 = threading.Thread(target=work)
t2 = threading.Thread(target=work)
t1.start()
t2.start()
t1.join()
t2.join()