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
1 >>> str = "this is string example....wow!!!"; 2 >>> str.ljust(50,‘0‘) 3 ‘this is string example....wow!!!000000000000000000‘ 4 >>> str.ljust(50) 5 ‘this is string example....wow!!! ‘ 6 >>> str.rjust(50) 7 ‘ this is string example....wow!!!‘ 8 >>> str.rjust(50,‘0‘) 9 ‘000000000000000000this is string example....wow!!!‘ 10 >>> str.center(50,‘0‘) 11 ‘000000000this is string example....wow!!!000000000‘ 12 >>> str.center(50) 13 ‘ this is string example....wow!!! ‘ 14 >>> str.zfill(50) 15 ‘000000000000000000this is string example....wow!!!‘ 16 >>>
python ljust,rjust,center,zfill对齐使用方法
原文：http://www.cnblogs.com/guigujun/p/6133279.html