用外语观看电影或电视节目对于学习该语言非常有用，通常可以在字幕网站上找到字幕文件（srt文件）。但是，这些文件不容易阅读，因为它们标有时间戳。因此，本代码旨在将srt字幕文件转换txt文本文件。
使用文本阅读器打开的srt字幕文件是这样的：
172
00:11:20,639 --> 00:11:24,393
To try to quote Ellen Yindel's
outstanding record in the time I have...173
00:11:24,560 --> 00:11:26,103
would do her a disservice.174
00:11:26,270 --> 00:11:29,190
Instead I offer the new commissioner
my sympathy...175
00:11:29,357 --> 00:11:32,526
knowing the impossible job
she is about to face.
但是我们想看到的是这样的文本文件：
To try to quote Ellen Yindel's outstanding record in the time I have...
would do her a disservice.
Instead I offer the new commissioner my sympathy...
knowing the impossible job she is about to face.
使用以下代码可以实现srt字幕文件转换为txt文本文件
Python代码如下：
a = 1
b = 2
c = 3
state = a
text = ''
with open('test1.srt', 'r', utf-8-sig) as f: #打开srt字幕文件，并去掉文件开头的\ufeff
for line in f.readlines(): #遍历srt字幕文件
if state == a: #跳过第一行
state = b
elif state == b: #跳过第二行
state = c
elif state == c: #读取第三行字幕文本
if len(line.strip()) !=0:
text += ' ' + line.strip() #将同一时间段的字幕文本拼接
state = c
elif len(line.strip()) ==0:
with open('test1.txt', 'a') as fa: #写入txt文本文件中
fa.write(text)
text = '\n'
state = a
