python ljust,rjust,center,zfill對齊使用方法

字符串在輸出時的對齊:
S.ljust(width,[fillchar]) 
#輸出width個字符，S左對齊，不足部分用fillchar填充，默認的為空格。 
S.rjust(width,[fillchar]) #右對齊 
S.center(width, [fillchar]) #中間對齊 
S.zfill(width) #把S變成width長，並在右對齊，不足部分用0補足 

實例

>>> str = "this is string example....wow!!!";
>>> str.ljust(50,'0')
'this is string example....wow!!!000000000000000000'
>>> str.ljust(50)
'this is string example....wow!!!                  '
>>> str.rjust(50)
'                  this is string example....wow!!!'
>>> str.rjust(50,'0')
'000000000000000000this is string example....wow!!!'
>>> str.center(50,'0')
'000000000this is string example....wow!!!000000000'
>>> str.center(50)
'         this is string example....wow!!!         '
>>> str.zfill(50)
'000000000000000000this is string example....wow!!!'
>>>