模块-时间模块(new)

模块-时间模块

1. 导入:

import time

1. 方法:

_STRUCT_TM_ITEMS __doc__ __loader__ __name__

__package__ __spec__ altzone asctime clock

ctime daylight get_clock_info gmtime localtime

mktime monotonic perf_counter process_time sleep

strftime strptime struct_time time timezone

tzname

 

1. 常用方法:
   1. time.time()获得时间戳

In [3]: time.time()

Out[3]: 1508852319.6068738

In [4]: help(time.time)

Help on built-in function time in module time:

time(...)

time() -> floating point number

 

Return the current time in seconds since the Epoch.

Fractions of a second may be present if the system clock provides them.

1. time.clock() 返回处理器时间

In [6]: time.clock()

Out[6]: 4.105489737712577e-07

 

1. time.gmtime()结构化时间,BUT,这个时间是标准世界时间

In [8]: time.gmtime()

Out[8]: time.struct_time(tm_year=2017, tm_mon=10, tm_mday=24, tm_hour=13, tm_min=44, tm_sec=15, tm_wday=1, tm_yday=297, tm_isdst=0)

 

1. time.localtime() ps当前时间2017年10月24日21:49:49

In [9]: time.localtime()

Out[9]: time.struct_time(tm_year=2017, tm_mon=10, tm_mday=24, tm_hour=21, tm_min=47, tm_sec=24, tm_wday=1, tm_yday=297, tm_isdst=0)

In [11]: time.localtime().tm_mon

Out[11]: 10

 

In [12]: time.localtime().tm_mday

Out[12]: 24

 

1. strftime() 可以只传入一个参数

In [16]: time.strftime("%Y-%m-%d %H:%M:%S",time.localtime())

Out[16]: '2017-10-24 21:59:02'

In [17]: time.strftime("%Y-%m-%d %H:%M:%S")

Out[17]: '2017-10-24 22:00:21'

 

1. strptime()将格式化时间转化为结构化时间

In [18]: time.strptime('2017-10-24 22:00:21',"%Y-%m-%d %H:%M:%S")

Out[18]: time.struct_time(tm_year=2017, tm_mon=10, tm_mday=24, tm_hour=22, tm_min=0, tm_sec=21, tm_wday=1, tm_yday=297, tm_isdst=-1)

 

1. 将时间戳转换为时间

In [23]: time.ctime(time.time()+1000)

Out[23]: 'Tue Oct 24 22:24:26 2017'

 

1. 将结构化时间转化成时间戳

In [25]: time.mktime(time.localtime())

Out[25]: 1508854287.0

 

1. 方法总结

 

time() -- return current time in seconds since the Epoch as a float

clock() -- return CPU time since process start as a float

sleep() -- delay for a number of seconds given as a float

gmtime() -- convert seconds since Epoch to UTC tuple

localtime() -- convert seconds since Epoch to local time tuple

asctime() -- convert time tuple to string

ctime() -- convert time in seconds to string

mktime() -- convert local time tuple to seconds since Epoch

strftime() -- convert time tuple to string according to format specification

strptime() -- parse string to time tuple according to format specification

tzset() -- change the local timezone

import datetime

datetime.datetime.now()

datetime.datetime.today()

 

Tip1:时间戳转时间

In [47]: time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(123456789))

Out[47]: '1973-11-30 05:33:09'

Tip2:时间转时间戳:

In [50]: time.mktime(time.strptime('1973-11-30 05:33:09',"%Y-%m-%d %H:%M:%S"))

Out[50]: 123456789.0

 

 

time.time()	return current time in seconds since the Epoch as a float	In [52]: time.time() Out[52]: 1508856310.5973513
time.clock()	return CPU time since process start as a float	In [54]: time.clock() Out[54]: 3867.513597997835
time.sleep(seconds)	delay for a number of seconds given as a float	In [56]: time.sleep(1)
time.gmtime(seconds=None)	convert seconds since Epoch to UTC tuple	In [57]: time.gmtime(123456) Out[57]: time.struct_time(tm_year=1970, tm_mon=1, tm_mday=2, tm_hour=10, tm_min=17, tm_sec=36, tm_wday=4, tm_yday=2, tm_isdst=0)
time.localtime(seconds=None)	convert seconds since Epoch to local time tuple	In [60]: time.localtime(123456) Out[60]: time.struct_time(tm_year=1970, tm_mon=1, tm_mday=2, tm_hour=18, tm_min=17, tm_sec=36, tm_wday=4, tm_yday=2, tm_isdst=0)
time.ctime(seconds=None)	convert time in seconds to string	In [61]: time.ctime() Out[61]: 'Tue Oct 24 22:52:54 2017'
time.mktime(p_tuple)	convert local time tuple to seconds since Epoch	In [63]: time.mktime(time. localtime (123456)) Out[63]: 123456.0
time.strftime(format, p_tuple=None)	convert time tuple to string according to format specification	In[64]: time.strftime("%y-%m-%d") Out[64]: '17-10-24'
time.strptime(string, format)	parse string to time tuple according to format specification	In [65]: time.strptime('17-10-24',"%y-%m-%d") Out[65]: time.struct_time(tm_year=2017, tm_mon=10, tm_mday=24, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=1, tm_yday=297, tm_isdst=-1)