Python : 日期時間的格式化輸出

1. 匯入 datetime 模組，建立今天的日期時間物件
   多多利用 Visual Studio Code的 intellisense (intellicode) 的功能，可以藉提示的功能，多認識一些模組內的class(類別)、方法、屬性。
   
2. 格式化輸出 今天(現在)的日期時間內容
   # 匯入 datetime 模組，並以 mDT 作為 datetime 的別名
   import datetime as mDT
   # 使用 mDT 模組，建立一個今天的日期時間(datetime)物件 oToday
   oToday=mDT.datetime.today()
   print(oToday.strftime('%Y-%m-%d %H:%M:%S.%f'))
   # >>>2019-08-06 14:27:59.485471
   
   
3. 格式化輸出的代碼、說明、及對應輸出範例：
   

   代碼	輸出說明	輸出範例
   %a	Weekday as locale’s abbreviated name.	Sun, Mon, …, Sat (en_US); So, Mo, …, Sa (de_DE)
   %A	Weekday as locale’s full name.	Sunday, Monday, …, Saturday (en_US); Sonntag, Montag, …, Samstag (de_DE)
   %w	Weekday as a decimal number, where 0 is Sunday and 6 is Saturday.	0, 1, …, 6
   %d	Day of the month as a zero-padded decimal number.	01, 02, …, 31
   %b	Month as locale’s abbreviated name.	Jan, Feb, …, Dec (en_US); Jan, Feb, …, Dez (de_DE)
   %B	Month as locale’s full name.	January, February, …, December (en_US); Januar, Februar, …, Dezember (de_DE)
   %m	Month as a zero-padded decimal number.	01, 02, …, 12
   %y	Year without century as a zero-padded decimal number.	00, 01, …, 99
   %Y	Year with century as a decimal number.	0001, 0002, …, 2013, 2014, …, 9998, 9999
   %H	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, …, 23
   %I	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, …, 12
   %p	Locale’s equivalent of either AM or PM.	AM, PM (en_US); am, pm (de_DE)
   %M	Minute as a zero-padded decimal number.	00, 01, …, 59
   %S	Second as a zero-padded decimal number.	00, 01, …, 59
   %f	Microsecond as a decimal number, zero-padded on the left.	000000, 000001, …, 999999
   %z	UTC offset in the form ±HHMM[SS[.ffffff]] (empty string if the object is naive).	(empty), +0000, -0400, +1030, +063415, -030712.345216
   %Z	Time zone name (empty string if the object is naive).	(empty), UTC, EST, CST
   %j	Day of the year as a zero-padded decimal number.	001, 002, …, 366
   %U	Week number of the year (Sunday as the first day of the week) as a zero padded decimal number. All days in a new year preceding the first Sunday are considered to be in week 0.	00, 01, …, 53
   %W	Week number of the year (Monday as the first day of the week) as a decimal number. All days in a new year preceding the first Monday are considered to be in week 0.	00, 01, …, 53
   %c	Locale’s appropriate date and time representation.	Tue Aug 16 21:30:00 1988 (en_US); Di 16 Aug 21:30:00 1988 (de_DE)
   %x	Locale’s appropriate date representation.	08/16/88 (None); 08/16/1988 (en_US); 16.08.1988 (de_DE)
   %X	Locale’s appropriate time representation.	21:30:00 (en_US); 21:30:00 (de_DE)
   %%	A literal '%' character.	%

   
   
4. 參考資料：
   https://docs.python.org/3.7/library/datetime.html?highlight=datetime%20format#datetime.date.__format__