import datetime, Calendardate = Datetime.datetime.now () Gets the current system time #1, return to yesterday's datedef getyesterday ():Today=datetime.date.today ()Oneday=datetime.timedelta (Days=1)Yesterday=today-onedayreturn yesterday #2, return to today's datedef gettoday ():return Datetime.date.today () #3, gets the date of the previous day of the given argument, returns a listdef getdaysbynum (num):Today=datetime.date.today ()Oneday=datetime.timedelta (Days=1)li=[]For i in range (0,num):#今天减一天, day by day minusToday=today-oneday#把日期转换成字符串#result =datetostr (today)Li.append (Datetostr (today))return Li #4, converting a string to a datetime typedef strtodatetime (datestr,format):return Datetime.datetime.strptime (Datestr,format) #5, time converted to string, formatted as 2008-08-02def datetostr (date):return str (date) [0:10] #6, two days apart, for example: 2008-10-03 and 2008-10-01 are two days apartdef datediff (begindate,enddate):format= "%y-%m-%d"; bd=strtodatetime (Begindate,format)ed=strtodatetime (Enddate,format)Oneday=datetime.timedelta (Days=1)count=0While bd!=ed:Ed=ed-onedaycount+=1return Count #7, gets all the time of two time periods, returns a listdef getDays (begindate,enddate):format= "%y-%m-%d"; bd=strtodatetime (Begindate,format)ed=strtodatetime (Enddate,format)Oneday=datetime.timedelta (Days=1)Num=datediff (begindate,enddate) +1li=[]For i in range (0,num):Li.append (Datetostr (ed))Ed=ed-onedayreturn Li #8, gets the current year is a stringdef getYear ():return str (datetime.date.today ()) [0:4] #9, gets the current month is a stringdef getMonth ():return str (datetime.date.today ()) [5:7] #10, gets the current day is a stringdef getDay ():return str (datetime.date.today ()) [8:10]def getnow ():return Datetime.datetime.now () print gettoday ()print getyesterday ()print Getdaysbynum (3)print getDays (' 2008-10-01 ', ' 2008-10-05 ')print ' 2008-10-04 00:00:00 ' [0:10] Print str (getYear ()) +getmonth () +getday ()print Getnow () #11, format the string as time Import datetime>>> s= "2006-1-2"Print Datetime.datetime.strptime (S, "%y-%m-%d")2006-01-02 00:00:00Import Time>>> s= "2006-1-2">>> Time.strptime (S, "%y-%m-%d")>>> from time import *>>> strftime ("%y-%m-%d%h:%m:%s", LocalTime ())' 2011-10-12 03:00:58 '#12, converting a format string to a timestamp>>> a = "Sat Mar 22:24:24">>> B = mktime (Strptime (A, "%a%b%d%h:%m:%s%Y"))>>> Print B1238250264.0>>>#13, datetime example-----------------demo Calculation of two date difference days>>> Import datetime>>> D1 = Datetime.datetime (2005, 2, +)>>> D2 = Datetime.datetime (2004, +)>>> (D1-D2). days -Shows examples of calculation run times, displayed in secondsImport datetimestarttime = Datetime.datetime.now ()#long Runningendtime = Datetime.datetime.now ()print (endtime-starttime). Seconds #14, Python date of the previous few days>>> from datetime import Timedelta, date>>> Print date.today () + timedelta (days =-2) (not a bit like date-d)2011-10-09>>> demonstrates the time to calculate the current time backwards by 10 hours. >>> D1 = Datetime.datetime.now ()>>> d3 = d1 + Datetime.timedelta (hours=10)>>> d3.ctime ()The classes used in this book are: DateTime and Timedelta two. They can be added and reduced between each other. Each class has some methods and properties to view the specific values. #15, depending on the number of days to start, returns a list of dates relative to today such as mydate (0). Getdaysbynum (1, 7) will get a list of dates from the week beginning yesterday. class MyDate: def __init__ (self, i):self.i = i def getdaysbynum (self, St, en):today = Datetime.date.today () + Datetime.timedelta (-SELF.I)oneday = Datetime.timedelta (Days=1)Global Yesterdayyesterday = Today-onedayli = []for I in range (0, en):today = Today-onedayli.append (str (today). Replace ("-", ""))return Li[st-1:en] #16, Glob: You can use simple methods to match all subdirectories or files in a directory, and the usage is simple. Glob.glob (regression) returns a listGlob.iglob (regression) returns a walker
Python Learning--datetime Module
