python求时间差

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import datetime
# 求时间差，传入timestart和timestop都是
# 用datetime.datetime.now()的返回值
def timediff(timestart, timestop):
t  = (timestop-timestart)
time_day = t.days
s_time = t.seconds
ms_time = t.microseconds / 1000000
usedtime = int(s_time + ms_time)
time_hour = usedtime / 60 / 60
time_minute = (usedtime - time_hour * 3600 ) / 60
time_second =  usedtime - time_hour * 3600 - time_minute * 60
time_micsecond = (t.microseconds - t.microseconds / 1000000) / 1000
retstr = "%d天%d小时%d分%d秒%d毫秒"  %(time_day, time_hour, time_minute, time_second, time_micsecond)
return retstr


备注：python输出普通格式的时间，用str(datetime.datetime.now())[:19]即可，日期则是[:10]。