Python修改文本列对齐

letter                   ->
LadderScore0                   ->
LadderScore1                   ->
LadderScore2                   ->
LadderScore3                   ->
LadderScore4                   ->
LadderScore5                   ->
LadderScore6                   ->
LadderScore7                   ->
LadderScore8                   ->
LadderScore9                   ->
WeeklyDoneCount0                   ->
WeeklyDoneCount1                   ->
WeeklyDoneCount2                   ->
WeeklyDoneCount3                   ->
WeeklyDoneCount4                   ->
WeeklyDoneCount5                   ->
WeeklyDoneCount6                   ->
WeeklyDoneCount7                   ->
WeeklyDoneCount8                   ->
WeeklyDoneCount9                   ->
LastFPS0                   ->
LastFPS1                   ->
LastFPS2                   ->
LastFPS3                   ->
LastFPS4                   ->
LastFPS5                   ->
LastFPS6                   ->
LastFPS7                   ->
LastFPS8                   ->
LastFPS9                   ->

#!/usr/bin/env python
#coding:utf-8

import os
format = '%-*s%-*s\n'
file = open('a.txt','r')
f = open('file.txt','a')
all = ""
for i in file:
i=i.split(' ')
a = format % (20, i[0], 20, '->')
all += a
f.write(a)
f.close()
file.close()
print all