Python Date Action Learning notes

For example, with print ', '. Join (Datelist)
You can put all the items in the Datelist list into a string, which, of course, inserts a comma in the middle of each item, which is more concise than looping.
Date operation must use the time or datetime library
Import time
>>> s= "2006-1-2"
>>> Time.strptime (S, "%y-%m-%d")
This is the date and time that the string format is converted into a Date object
The corresponding meaning of the escape character is as follows
%a Local Simplified Week name
%A Local Full week name
%b a locally simplified month name
%B Local Full month name
%c Local corresponding date representation and time representation
One day in%d months (0-31)
%H 24-hour hours (0-23)
%I 12-hour hours (01-12)
%j Day of the Year (001-366)
%m Month (01-12)
%M minutes (00=59)
%p the equivalent of a local a.m. or p.m.
%s seconds (00-59)
%u weeks of the year (00-53) Sunday is the beginning of the week
%w Week (0-6), Sunday for the beginning of the week
%W Week of the Year (00-53) Monday is the beginning of the week
%x Local corresponding date representation
%x Local corresponding time representation
%y Two-digit year representation (00-99)
%Y Four-digit year representation (000-9999)
%Z the name of the current time zone
Percent% of the number itself
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#-*-Coding:utf-8-*-
Import time
Import datetime
# 2007-11-25 15:36:35
#使用datetime模块可以很方便的解决这个问题, examples are as follows:
D1 = Datetime.datetime (2005, 2, 16)
D2 = Datetime.datetime (2004, 12, 31)
# Results: 47
Print (D1-D2). Days
#上例演示了计算两个日期相差天数的计算.
StartTime = Datetime.datetime.now ()
Endtime = Datetime.datetime.now ()
Print (endtime-starttime). seconds
#上例演示了计算运行时间的例子, displayed in seconds.
D1 = Datetime.datetime.now ()
D3 = D1 + Datetime.timedelta (days =10)
Print STR (d3)
Print D3.ctime ()
# The previous example shows the time to calculate the current time backwards by 10 days.
# if it's the hour days change to hours
# 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 specific values, such as DateTime can be viewed: Days (day), hours (hour), Day of the Week (weekday ()), etc.;
# Timedelta can view: days, seconds (seconds), etc.
#
# Time, datetime, string types convert each other
#
# string-Time
# Time.strptime (publishdate, "%y-%m-%d%h:%m:%s")
#
# Time-string
# time.strftime ("%y-%m-%d", T)
Date = ' 2007-01-01 '
Print type (date)
Date = Time.strptime (date, "%y-%m-%d")
Print type (date)
Print Date[0]
D4 = Datetime.datetime (Date[0], date[1],date[2])
Print D4
Print type (D4)
#将日期时间对象转成字符串则要用
Date = Time.strftime ("%y-%m-%d", date)
Print type (date)
#其中d为日期时间对象

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