Python module--time module

Python module--time module

First, the Python Time introduction:

There are two ways to represent time in Python:   

1, timestamp notation, that is, an integer or float type is a time interval in seconds. The base value for this time is calculated from 0 o'clock on January 1 in 1970.

2, tuple format notation, that is, a Python of the Data Structure representation. This tuple has 9 integral types of content. Each represents a different time meaning.

Second, the DateTime module

2.1 All functions of the DateTime module

In [2]: Dir (datetime) out[2]: [' maxyear ', ' minyear ', ' __doc__ ', ' __file__ ', ' __name__ ', ' __package__ ', ' Date ', ' DateTime ' , ' Datetime_capi ', ' time ', ' Timedelta ', ' Tzinfo ']in [3]:

2.2 DateTime module functions

Datetime.datetime.now () Gets the current system time

In [9]: Print Datetime.datetime.now () 2016-11-29 12:27:55.391272#datetime.datetime.now (). Strftime ('%y-%m-%d%h:%m:%s ') #一般用于数据库跟时间有关字段的赋值 #in []: Print Datetime.datetime.now (). Strftime ('%y-%m-%d%h:%m:%s ') 2016-11-29 13:26:22

Datetime.date.today () get today's date

in [+]: Print datetime.date.today () 2016-11-29

Datetime.timedelta (Days=x) Given two time difference values

In [16]: help (Datetime.timedelta) Class timedelta (__builtin__.object)  |   difference between two datetime values. |   |  methods  Defined here: |   |  __abs__ (...)  |      x.__abs__ ()  <==> abs (x)  |   |   __add__ (...)  |      x.__add__ (y)  <==> x+y |   |   __div__ (...)  |      x.__div__ (y)  <==> x/y |   |   __eq__ (...)  |      x.__eq__ (y)  <==> x==y |   |   __floordiv__ (...)  |      x.__floordiv__ (y)  <==> x//y |    |  __ge__ (...)  |      x.__ge__ (y)   <==> x>=y |   |  __getattribute__ (...)  |      x.__getattribute__ (' name ')  <==> x.name# #小李子In   [14]: print datetime.timedelta (Days=1) 1 day, 0:00:00

Datetime.datetime.strptime () converts a string format into a time

# #注意这个函数字符串中连接符只能是 '-', others will error In [26]: print datetime.datetime.strptime ("2016-12-20", '%y-%m-%d ') 2016-12-20 00:00:00in [25]: print datetime.datetime.strptime ("2016 12 20", '%Y-% m-%d ')---------------------------------------------------------------------------valueerror                                  Traceback  (Most recent call  last) <ipython-input-25-aac02a333bd5> in <module> ()----> 1 print  Datetime.datetime.strptime ("2016 12 20", '%y-%m-%d ')/usr/local/python2.7/lib/python2.7/_strptime.pyc  in _strptime (Data_string, format)     323     if  not found:    324         raise  valueerror ("time&Nbsp;data %r does not match format %r " %--> 325                             (Data_string, format)     326      if len (data_string)  != found.end ():    327          raise valueerror ("unconverted data remains: %s"  % valueerror: time data  ' 2016 12 20 '  does not match format  '% y-%m-%d ' In [27]: import timein [28]: time.strftime ("%y-%m-%d %h:%m:%s", Time.localtime ()) out[28]:  ' 2016-11-29 13:18:21 '

Three, Time module

3.1 All functions of the time module

In [3]: Dir (Time) out[3]: [' __doc__ ', ' __file__ ', ' __name__ ', ' __package__ ', ' accept2dyear ', ' altzone ', ' asctime ', ' clock ', ' ctime ', ' Daylight ', ' gmtime ', ' localtime ', ' mktime ', ' sleep ', ' strftime ', ' strptime ', ' struct_time ', ' time ', ' Timezon ' E ', ' tzname ', ' Tzset ']

3.2 Time Module specific function explanation

time.time () --Returns the current timestamp, floating-point number form. Parameter not accepted

in [+]: Time.time () out[30]: 1480398573.196829

Time. sleep ()--delays a period of time, accepting integer, floating-point type.

In [ten]: Time.sleep (3) #执行完成后睡眠3秒

Time.localtime () -Converts the timestamp to a local time-tuple format. Accepts a floating-point timestamp parameter whose default value is the current timestamp.

In [All]: Time.localtime () out[11]: Time.struct_time (tm_year=2016, tm_mon=12, tm_mday=10, tm_hour=11, tm_min=49, tm_sec= Tm_wday=5, tm_yday=345, tm_isdst=0) in []: Time.localtime (1481341446.412076) out[13]: Time.struct_time (tm_year= Tm_mon=12, tm_mday=10, tm_hour=11, tm_min=44, tm_sec=6, tm_wday=5, tm_yday=345, tm_isdst=0)

Time.asctime ()-Converts the format of a time tuple to a string form. Accepts a time tuple whose default value is LocalTime () return value

in [+]: Time.asctime () out[14]: ' Sat Dec 11:51:26 ' in [Max]: Time.asctime ((2016,12,10,11,52,47,5,345,0)) out[23]: ' Sat Dec 10 11:52:47 2016 '

Time.strftime ()-Converts a time tuple to a string in the specified format. Accepts string formatting strings and time tuples. The time tuple is optional and defaults to LocalTime ()

in [+]: Time.strftime ("%Y%h:%m:%s") out[25]: ' 2016 11:59:55 '

Strptime ()--resolves the time string in the specified format to a time-tuple, strftime () reverse process. Accepts a string, time format 2 parameters, are required.

in [+]: time.strptime (' Sat 12:00:59 ') out[28]: Time.struct_time (tm_year=2016, tm_mon=12, tm_mday=10, Tm_hour =12, Tm_min=0, tm_sec=59, tm_wday=5, tm_yday=345, Tm_isdst=-1)

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Python module--time module