python ljust,rjust,center,zfill对齐使用方法

字符串在输出时的对齐:
S.ljust(width,[fillchar]) 
#输出width个字符，S左对齐，不足部分用fillchar填充，默认的为空格。 
S.rjust(width,[fillchar]) #右对齐 
S.center(width, [fillchar]) #中间对齐 
S.zfill(width) #把S变成width长，并在右对齐，不足部分用0补足 

实例

>>> 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!!!'
>>>