import datetime,time
start = datetime.datetime.now()
start_clock = time.clock()
time.sleep(1)
end = datetime.datetime.now()
end_clock = time.clock()
print start , end
print start_clock, end_clock
print end-start, end_clock-start_clock
#其中datetime输出的是日期格式的,格式时:分:秒;time下的clock函数输出的是实数,单位是秒