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python datetime物件轉時間戳

import datetime,threadinglockObject = threading.Lock()def testTime():    global lockObject    '''這個地方加個執行緒鎖,_strptime_time 執行緒不安全'''    lockObject.acquire()    t = datetime.datetime.now()    timeStamp =  time.mktime(t.timetuple())    lockObject.release()    return timeStampdef getTodayTimeStamp():    global lockObject    '''這個地方加個執行緒鎖,_strptime_time 執行緒不安全'''    lockObject.acquire()    now = datetime.datetime.now()    timeStamp = '%s 00:00:00' % now.strftime( '%Y-%m-%d' )    timeStamp = time.strptime( timeStamp, '%Y-%m-%d %X' )    timeStamp = int(time.mktime( timeStamp ))    lockObject.release()    return timeStamp