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Threading with locks

import threading, time b = 50 l = threading.Lock() def threadcode():     global b     print "Thread %s invoked" % threading.currentThread().getName()     l.acquire()     try:         print "Thread %s running" % threading.currentThread().getName()         time.sleep(1)         b = b + 50         print "Thread %s set b to %d" % (threading.currentThread().getName(),b)     finally:         l.release() print "Value of b at start of program:", b childthreads = [] for i in range(1, 5):     t = threading.Thread(target = threadcode, name = "Thread-%d" % i)     t.setDaemon(1)     t.start()     childthreads.append(t) for t in childthreads:     t.join() print "New value of b:", b