python datetime格式化参数

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　　坑爹啊，记忆力不行，老是记不住，都用了这么久了，记在这里以后来翻。
　　

DirectiveMeaningNotes%aLocale’s abbreviated weekdayname.%ALocale’s full weekday name.%bLocale’s abbreviated monthname.%BLocale’s full month name.%cLocale’s appropriate date andtime representation.%dDay of the month as a decimalnumber [01,31].%fMicrosecond as a decimalnumber [0,999999], zero-paddedon the left(1)%HHour (24-hour clock) as adecimal number [00,23].%IHour (12-hour clock) as adecimal number [01,12].%jDay of the year as a decimalnumber [001,366].%mMonth as a decimal number[01,12].%MMinute as a decimal number[00,59].%pLocale’s equivalent of eitherAM or PM.(2)%SSecond as a decimal number[00,61].(3)%UWeek number of the year(Sunday as the first day ofthe week) as a decimal number[00,53]. All days in a newyear preceding the firstSunday are considered to be inweek 0.(4)%wWeekday as a decimal number[0(Sunday),6].%WWeek number of the year(Monday as the first day ofthe week) as a decimal number[00,53]. All days in a newyear preceding the firstMonday are considered to be inweek 0.(4)%xLocale’s appropriate daterepresentation.%XLocale’s appropriate timerepresentation.%yYear without century as adecimal number [00,99].%YYear with century as a decimalnumber.%zUTC offset in the form +HHMMor -HHMM (empty string if thethe object is naive).(5)%ZTime zone name (empty stringif the object is naive).%%A literal '%' character.http://docs.python.org/library/datetime.html#strftime-strptime-behavior