[174]python计算程序运行时间

方法1

import datetimestarttime &＃61; datetime.datetime.now()#long runningendtime &＃61; datetime.datetime.now()print (endtime - starttime).seconds


方法 2

start &＃61; time.time()run_fun()end &＃61; time.time()print end-start


方法3

start &＃61; time.clock()run_fun()end &＃61; time.clock()print end-start


方法1和方法2都包含了其他程序使用CPU的时间&＃xff0c;是程序开始到程序结束的运行时间。

方法3算只计算了程序运行的CPU时间

Python中有两个模块可以完成时间操作&＃xff1a;time和datetime

相比较而言datetime更强大

以下分别是两个模块的具体信息

>>> dir(time)
[&＃39;__doc__&＃39;, &＃39;__name__&＃39;, &＃39;__package__&＃39;, &＃39;accept2dyear&＃39;, &＃39;altzone&＃39;, &＃39;asctime&＃39;, &＃39;clock&＃39;, &＃39;ctime&＃39;, &＃39;daylight&＃39;, &＃39;gmtime&＃39;,
&＃39;localtime&＃39;, &＃39;mktime&＃39;, &＃39;sleep&＃39;, &＃39;strftime&＃39;, &＃39;strptime&＃39;, &＃39;struct_time&＃39;, &＃39;time&＃39;, &＃39;timezone&＃39;, &＃39;tzname&＃39;, &＃39;tzset&＃39;]
>>> dir(datetime.datetime)
[&＃39;__add__&＃39;, &＃39;__class__&＃39;, &＃39;__delattr__&＃39;, &＃39;__doc__&＃39;, &＃39;__eq__&＃39;, &＃39;__format__&＃39;, &＃39;__ge__&＃39;, &＃39;__getattribute__&＃39;, &＃39;__gt__&＃39;,
&＃39;__hash__&＃39;, &＃39;__init__&＃39;, &＃39;__le__&＃39;, &＃39;__lt__&＃39;, &＃39;__ne__&＃39;, &＃39;__new__&＃39;, &＃39;__radd__&＃39;, &＃39;__reduce__&＃39;, &＃39;__reduce_ex__&＃39;, &＃39;__repr__&＃39;,&＃39;__rsub__&＃39;, &＃39;__setattr__&＃39;, &＃39;__sizeof__&＃39;, &＃39;__str__&＃39;, &＃39;__sub__&＃39;, &＃39;__subclasshook__&＃39;, &＃39;astimezone&＃39;, &＃39;combine&＃39;, &＃39;ctime&＃39;,
&＃39;date&＃39;, &＃39;day&＃39;, &＃39;dst&＃39;, &＃39;fromordinal&＃39;, &＃39;fromtimestamp&＃39;, &＃39;hour&＃39;, &＃39;isocalendar&＃39;, &＃39;isoformat&＃39;, &＃39;isoweekday&＃39;, &＃39;max&＃39;, &＃39;microsecond&＃39;,&＃39;min&＃39;, &＃39;minute&＃39;, &＃39;month&＃39;, &＃39;now&＃39;, &＃39;replace&＃39;, &＃39;resolution&＃39;, &＃39;second&＃39;, &＃39;strftime&＃39;, &＃39;strptime&＃39;, &＃39;time&＃39;, &＃39;timetuple&＃39;, &＃39;timetz&＃39;, &＃39;today&＃39;,
&＃39;toordinal&＃39;, &＃39;tzinfo&＃39;, &＃39;tzname&＃39;, &＃39;utcfromtimestamp&＃39;, &＃39;utcnow&＃39;, &＃39;utcoffset&＃39;, &＃39;utctimetuple&＃39;, &＃39;weekday&＃39;, &＃39;year&＃39;]


如果要获取微秒级别的时间差&＃xff0c;可以利用以下代码

import datetimebegin &＃61; datetime.datetime.now()
end &＃61; datetime.datetime.now()
k &＃61; end - beginprint (end-begin).days # 0 天数
print (end-begin).total_seconds() # 30.029522 精确秒数
print (end-begin).seconds # 30 秒数
print (end-begin).microseconds # 29522 毫秒数


再看下k的属性和方法

>>> dir(k)
[&＃39;__abs__&＃39;, &＃39;__add__&＃39;, &＃39;__class__&＃39;, &＃39;__delattr__&＃39;, &＃39;__div__&＃39;, &＃39;__doc__&＃39;, &＃39;__eq__&＃39;, &＃39;__floordiv__&＃39;, &＃39;__format__&＃39;, &＃39;__ge__&＃39;,
&＃39;__getattribute__&＃39;, &＃39;__gt__&＃39;, &＃39;__hash__&＃39;, &＃39;__init__&＃39;, &＃39;__le__&＃39;, &＃39;__lt__&＃39;, &＃39;__mul__&＃39;, &＃39;__ne__&＃39;, &＃39;__neg__&＃39;, &＃39;__new__&＃39;, &＃39;__nonzero__&＃39;,&＃39;__pos__&＃39;, &＃39;__radd__&＃39;, &＃39;__rdiv__&＃39;, &＃39;__reduce__&＃39;, &＃39;__reduce_ex__&＃39;, &＃39;__repr__&＃39;, &＃39;__rfloordiv__&＃39;, &＃39;__rmul__&＃39;, &＃39;__rsub__&＃39;, &＃39;__setattr__&＃39;,&＃39;__sizeof__&＃39;, &＃39;__str__&＃39;, &＃39;__sub__&＃39;, &＃39;__subclasshook__&＃39;, &＃39;days&＃39;, &＃39;max&＃39;, &＃39;microseconds&＃39;, &＃39;min&＃39;, &＃39;resolution&＃39;, &＃39;seconds&＃39;, &＃39;total_seconds&＃39;]


k为datetime.timedelta类型&＃xff0c;以上是timedelta的所有的属性和函数
利用以下代码可以获取以秒为单位的时间差&＃xff0c;小数点后6位为微秒。

k.total_seconds()>>> k.total_seconds()
2303.277522