以用户输入的格式提取一行文本中的信息 [英] Extract information in a line of text with a format from user input

问题描述

我正在尝试制作一个程序，以接收输入的歌曲文件和一种在文件中写入元标记的格式.以下是通话的一些示例:

I am trying to make a program which takes in input song files and a format to write metatags in file. Here is a few examples of the call:

• ./parser '%n_-_%t.mp3' 01_-_Respect.mp3给了我track=01; title=Respect
• ./parser '%b._%n.%t.mp3' The_Queen_of_Soul._01.Respect.mp3给了我album=The_Queen_of_Sould; track=01; title=Respect
• ./parser '%a-%b._%n.%t.mp3' Aretha_Franklin-The_Queen_of_Soul._01.Respect.mp3给了我artist=Aretha_Franklin; track=01; title=Respect
• ./parser '%a_-_%b_-_%n_-_%t.mp3' Aretha_Franklin_-_The_Queen_of_Soul_-_01_-_Respect.mp3给了我artist=Aretha_Franklin; track=01; title=Respect

• ./parser '%n_-_%t.mp3' 01_-_Respect.mp3 gives me track=01; title=Respect
• ./parser '%b._%n.%t.mp3' The_Queen_of_Soul._01.Respect.mp3 gives me album=The_Queen_of_Sould; track=01; title=Respect
• ./parser '%a-%b._%n.%t.mp3' Aretha_Franklin-The_Queen_of_Soul._01.Respect.mp3 gives me artist=Aretha_Franklin; track=01; title=Respect
• ./parser '%a_-_%b_-_%n_-_%t.mp3' Aretha_Franklin_-_The_Queen_of_Soul_-_01_-_Respect.mp3 gives me artist=Aretha_Franklin; track=01; title=Respect

对于文件01_-_Respect.mp3的调用，我想要一个包含01的变量，另一个包含Respect的变量.

For a call on the file 01_-_Respect.mp3, I'd like to have a variable containing 01, and the other Respect.

此处%n和%t分别代表歌曲的编号和标题.问题是我不知道如何在bash(或最终在python)中提取此信息.

Here %n and %t represents respectively the number and the title of the songs. The problem is that I don't know how to extract this information in bash (or eventually in python).

我最大的问题是我事先不知道格式！

My biggest problem is that I don't know the format in advance!

注意:除此以外，还有更多信息，例如专辑的%b，艺术家的%a等.

Note: There is more information than this, for example %b for the album, %a for the artist etc.

推荐答案

好，您可以使用字符串方法split用_-_分割字符串.

Well, you can use the string method split to split the string by _-_.

要从命令行获取输入，可以使用sys.argv来获取.

and for taking the input from the command line, you can use sys.argv to get that.

这是一个例子:

import sys
number,title = sys.argv[1].split("_-_")

更新:

您当然可以像这样将模式作为第一个参数传递，将文件作为第二个参数传递:

Surely you can pass the pattern as a first argument and the file as the second argument like that:

import sys
pattern = sys.argv[1]
number,title = sys.argv[2].split(pattern)

现在，如果您需要更复杂，更动态的处理，那么Regex是您的获奖卡片！

Now if you need more complex and dynamic processing, then Regex is your winning card!

为了编写一个好的正则表达式，您必须了解自己的数据和问题，否则最终会编写出一个小故障的正则表达式

And in order to write a good regex, you got to understand your data and your problem or you'll end up writing a glitchy regex

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