Python: how to use time library

Machine vision 001 2020-11-13 02:49:35
python use time library

Python:time How to use the library

time Kuo is Python Standard library for processing time in , How to use it is as follows :

import time

time The library contains three types of functions :

  • Time acquisition :time()   ctime()   gmtime()
  • Time format :strftime()   strptime()
  • Program timing :sleep()   perf_counter()

Time acquisition

function describe
time() Get the current timestamp , That is, the internal time value of the computer , Floating point numbers
ctime() Get the current time and express it in an easy to read way , Return string
'Tue Nov  3 20:09:36 2020'
gmtime() Get the current time , Expressed as a computer processable time format
time.struct_time(tm_year=2020, tm_mon=11, tm_mday=3, tm_hour=12, tm_min=10, tm_sec=24, tm_wday=1, tm_yday=308, tm_isdst=0)

Time format

function describe
strftime(tpl, ts) tpl Format template string , Used to define the output effect
ts It's a time type variable inside the computer
>>>t = time.gmtime()
>>>time.strftime("%Y-%m-%d %H:%M:%S",t)
'2020-11-03 12:14:08'

Format controls

Format meaning remarks
%a Local (locale) Simplified week name  
%A Local full week name  
%b Local simplified month name  
%B Local full month name  
%c Local corresponding date and time representation  
%d Day of the month (01 - 31)  
%H Hours of the day (24 hourly ,00 - 23)  
%I The first few hours (12 hourly ,01 - 12)  
%j The day of the year (001 - 366)  
%m month (01 - 12)  
%M Minutes (00 - 59)  
%p Local am perhaps pm Corresponding symbol One
%S second (01 - 61) Two
%U Weeks of the year .(00 - 53 Sunday is the beginning of a week .) All days before the first Sunday are on the 0 Zhou . 3、 ... and
%w Day of the week (0 - 6,0 It's Sunday. ) 3、 ... and
%W and %U Basically the same , The difference is %W Monday is the beginning of the week .  
%x Local corresponding date  
%X Local corresponding time  
%y Years without Century (00 - 99)  
%Y Full year  
%Z Name of time zone ( If there is no empty character )  
%% ‘%’ character  

remarks :

  1. “%p” Only with “%I” It's only effective when used together .

  2. It is emphasized in the document that 0 - 61, instead of 59, Leap years take two seconds ( A sweat ).

  3. When using strptime() Function time , Only when the weeks and days of the year are determined %U and %W Will be calculated .

Formatted string date / Time description Value ranges and instances
%Y year 0000~9999, for example :1900
%m month 01~12, for example :10
%B The name of the month January~December, for example :April
%b Month name abbreviation Jan~Dec, for example :Apr
%d date 01~31, for example :25
%A week Monday~Sunday, for example :Wednesday
Formatted string date / Time description Value ranges and instances
%a Week abbreviation Mon~Sun, for example :Wed
%H Hours (24h system ) 00~23, for example :12
%h Hours (12h system ) 01~12, for example :7
%p On / Afternoon AM, PM, for example :PM
%M minute 00~59, for example :26
%S second 00~59, for example :26
function describe
strptime(str, tpl) str It's a string of time values
tpl Format template string , Used to define the input effect
>>>timeStr = '2020-11-03 12:17:18'
>>>time.strptime(timeStr, "%Y-%m-%d %H:%M:%S")
time.struct_time(tm_year=2020, tm_mon=11, tm_mday=3, tm_hour=12, tm_min=16, tm_sec=45, tm_wday=1, tm_yday=308, tm_isdst=-1)

Program timing

function describe
perf_counter() Return to one CPU Level of precise timekeeping , The unit is in seconds
Because the starting point of this count is uncertain , It makes sense to call the difference continuously
>>>time_start = time.perf_counter()
>>>time_end = time.perf_counter()
>>>time_end - time_start
function describe
sleep(s) s Time to sleep , The unit is seconds , It could be a floating-point number
>>>def time_wait():
>>>time_wait() # The program will wait for 3.3 Exit in seconds







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