正则表达式之处理一组lrc听力文件

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:::text
[00:00.12]section 2.
[00:02.68]you will part of a radio programme about the opening of a new local sports shop.
[00:09.32]first you have some time to look at questions 11 to 16.
[00:39.64]now listen carefully and answer questions 11 to 16.
[00:48.24]now we go to Jane who is going to tell us about what's happening in town this weekend.
[00:52.24]right,thanks Andrew,
[00:53.92]and now on to what's new,
[00:56.48]and do we really need yet another sports shop in Bradcaster?
[01:01.24]well,most of you probably know Sports World-
[01:04.44]the branch of a Danish sports goods company that opened a few years ago-
[01:09.04]it's attracted a lot of custom,
[01:11.36]and so the company has now decided to open another branch in the area.
[01:16.60]it's going to be in the shopping centre to the west of Bradcaster,
[01:20.44]so that will be good news for all of you who've found the original shop in the north of the town hard to get to.
[01:27.12]i was invited to a special preview
[01:29.60]and i can promise you,this is the ultimate in sports retailing.
......

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:::text
0.12      2.68   section 2.
2.68      9.32   you will part of a radio programme about the opening of a new local sports shop.
9.32     39.64   first you have some time to look at questions 11 to 16.
39.64    48.24   now listen carefully and answer questions 11 to 16.
48.24    52.24   now we go to Jane who is going to tell us about what's happening in town this weekend.
52.24    53.92   right,thanks Andrew,
53.92    56.48   and now on to what's new,
56.48    61.24   and do we really need yet another sports shop in Bradcaster?
61.24    64.44   well,most of you probably know Sports World-
64.44    69.04   the branch of a Danish sports goods company that opened a few years ago-
69.04    71.36   it's attracted a lot of custom,
71.36    76.60   and so the company has now decided to open another branch in the area.
76.60    80.44   it's going to be in the shopping centre to the west of Bradcaster,
80.44    87.12   so that will be good news for all of you who've found the original shop in the north of the town hard to get to.
87.12    89.60   i was invited to a special preview
89.60    94.88   and i can promise you,this is the ultimate in sports retailing.
......

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#!/usr/bin/env python
# encoding: utf-8
import re
import os
import sys
from decimal import Decimal as D

def filter_filetype(path,filetype):
    filetype = filetype.lower()
    filenames = [filename for filename in os.listdir(path)
        if os.path.isfile(os.path.join(path, filename))] #Get all regular files
    filter_filename_list = [filename for filename in filenames if filename.endswith(filetype)]
    return filter_filename_list

def min_sec_str2sec_str(min_sec_str):
    '''minute:second change to second'''
    (m,s) = min_sec_str.split(":")
    sec = 60*D(m)+D(s)
    sec_str = str(sec)
    return sec_str

def format_file_time(filename):
    with open(filename,"r") as input_file:
        content = input_file.read()
        thetime = re.compile(r"\[(\d{2}:.{5})\]")
        #match is list: ['00:00.12',...]
        match = thetime.findall(content)
        sec_strs = [min_sec_str2sec_str(min_sec_str) for min_sec_str in match ]
        #再一次推导，使其成为新的格式，注意边界
        new_format = ["{:<6s}  {:>6s}   ".format(sec_str,sec_strs[i+1]) for i,sec_str in enumerate(sec_strs) if i<len(sec_strs)-1] #最后一行是边界
        #单独添加最后一行
        #new_format.append(sec_strs[-1])#list本身被改变了
        #print new_format
        #exit()
    filename_split = filename.split(".")
    #后缀改为txt
    out_filename = filename_split[0]+"_output.txt"
    output_file = open(out_filename,"w")
    with open(filename,"r") as input_file:
        i = 0 #行号标记
        for line in input_file:
            if i==len(sec_strs)-1:
                #最后一行不要
                break
            result_line = thetime.sub(new_format[i],line)
            #print result_line
            output_file.write(result_line)
            i = i+1
    output_file.close()
    
if __name__ == "__main__":
    path = sys.argv[1]
    filetype = sys.argv[2]
    filter_filename_list = filter_filetype(path,filetype)
    for filename in filter_filename_list:
        print(os.path.join(path,filename))
        format_file_time(os.path.join(path,filename))
        #注意路径