Summary of several methods for processing time in Python, and several methods for python

Summary of several methods for processing time in Python, and several methods for python

Starting from a string

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  >>>time_str='2008-08-08 08:08:08' 

1. 1. Time converted to struct_time format

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  >>struct = ime.strptime(time_str,'%Y-%m-%d %H:%M:%S')     time.struct_time(tm_year=2008, tm_mon=8, tm_mday=8, tm_hour=8, tm_min=8, tm_sec=8, tm_wday=4, tm_yday=221, tm_isdst=-1) 

. If you want to obtain the corresponding timestamp (in seconds ):

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   >>>sec=time.mktime(struct)   >>> sec   1218154088.0 

1.3.struct _ time format returns the start string:
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  >>time_str=time.strftime("%Y-%m-%d %H:%M:%S",struct)   >>> time_str   '2008-08-08 08:08:08'  

. What should I do if the time stamp (in seconds) is returned in the struct_time format?
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  <pre name="code" class="python">>> time.gmtime(sec)   time.struct_time(tm_year=2008, tm_mon=8, tm_mday=8, tm_hour=0, tm_min=8, tm_sec=8, tm_wday=4, tm_yday=221, tm_isdst=0) 

. The timestamp (number of seconds) should be returned to the string to know how to get it?

Of course, there are very direct methods, but the time formats for conversion back are different:
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  >>> time.ctime(sec)   'Fri Aug 08 08:08:08 2008'  

. To get the current time:

Today:
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  >>> datetime.date.today()       datetime.date(2015, 4, 3) 

Now:
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  >>> datetime.datetime.now()       datetime.datetime(2015, 4, 3, 15, 19, 47, 361000) 

Current timestamp:

 >>> time.time()1428045689.396

Current struct_time format time:

>>> time.localtime()time.struct_time(tm_year=2015, tm_mon=4, tm_mday=3, tm_hour=15, tm_min=21, tm_sec=52, tm_wday=4, tm_yday=93, tm_isdst=0)

The current UTC date format:

 >>> time.ctime()  'Fri Apr 03 15:23:45 2015'

1.7) What should I do if I want to convert datetime. date/datetime/time To struct_time?

 >>> datetime.datetime.now().timetuple()   time.struct_time(tm_year=2015, tm_mon=4, tm_mday=3, tm_hour=15, tm_min=31, tm_sec=19, tm_wday=4, tm_yday=93, tm_isdst=-1)

In this way, is it easy to convert the data into seconds when combined with 1.2?

1.8.datetime.date/how to convert a date in the datetime format to a string in the '2017-01-01 00:00:00 'format?

Is it easy to combine 1.3 and 1.7?
1. 9. How to convert a string to datetime. date/datetime/time?
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  >>> datetime.datetime.strptime('2014-01-01',"%Y-%m-%d")      datetime.datetime(2014, 1, 1, 0, 0) 

2. 0. then convert struct_time to datetime. date/datetime/time.

Under what circumstances do you need to convert struct_time to datetime. date/datetime/time. After reading 2.1, you will understand
2.1 time calculation-addition and subtraction of time

How was yesterday counted?
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  >> today=datetime.date.today() 

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  >>> delta=datetime.timedelta(days=1)   >>> yesterday=today-delta   >>> yesterday    datetime.date(2015, 4, 2)  

What about tomorrow? Seven days ago? One minute ago (), one second?

Take a look at this constructor:

Class datetime. timedelta ([days [, seconds [, microseconds [, milliseconds [, minutes [, hours [, weeks]) can help you answer the above questions?

Note that struct_time and string cannot be computed with datetime. timedelta. So it is useful to convert from other forms to datetime. date/datetime/time.

Of course, struct_time can also be used for time calculation. For example, to calculate yesterday:

 >>from time import time,localtime >>day = 24*60*60 >>yesterday = localtime(time()-day)

2.2) time comparison:

This is just one sentence: datetime. (date/datetime/time.) And struct_time can be compared. (Cannot be compared with each other)