python 3.3 计算两个日期间隔秒数/天数

>>> import datetime
>>> d1 = datetime.datetime.now()
>>> d2 = datetime.datetime.now()
>>> interval = d2 - d1
>>> interval
datetime.timedelta(0, 14, 670206)
>>> sec = interval.days*24*3600 + interval.seconds
>>> sec
14
>>> total_sec = interval.total_seconds()
>>> total_sec
14.670206
>>>>>> import datetime
>>> d1 = datetime.dat