Python Cookbook 1.4 排列字符

问题：
想要让输出的字符能够按照左对齐,右对齐,居中对齐的格式排列

解决方法:
在Python中,是用str的rjust,ljust,center方法来实现上述的功能.看下面的例子:
>>> print '|', 'hej'.ljust(20), '|', 'hej'.rjust(20), '|', 'hej'.center(20), '|'
| hej             |             hej |       hej       |

>>> print 'hej'.center(20, '+')
++++++++hej+++++++++

相关说明:

ljust(...)
    S.ljust(width[, fillchar]) -> string
   
    Return S left justified in a string of length width. Padding is
    done using the specified fill character (default is a space).

rjust(...)
    S.rjust(width[, fillchar]) -> string
   
    Return S right justified in a string of length width. Padding is
    done using the specified fill character (default is a space)

center(...)
    S.center(width[, fillchar]) -> string
   
    Return S centered in a string of length width. Padding is
    done using the specified fill character (default is a space)