如何在 re.findall 中使用变量？

Question

I'm extremely new to Python, so I'm sorry if my question is rather stupid. I have a bunch of long strings in one list and shortened parts of it in another list

Like:

Long string is D:\\Python\\Songs\\testsong.mp3 and short string is \\testsong.mp3

And I want to get a list containing 'Songs' (basically the name of the folder containing the mp3) but I have multiple folders and multiple songs so I'm trying to use re.findall but it only accepts defined patterns and my patterns change due to different songs names.

Answer 1

from pathlib import Path

directories = [
    "D:/Python/Songs/testsong.mp3",
    "C:/users/xyz/desktop/anothersong.mp3"
]

song_folder_names = set(Path(directory).parts[-2] for directory in directories)
print(song_folder_names)

Output:

{'desktop', 'Songs'}
>>> 

Notice, that the order of the folder names is not preserved - because I'm using a set .

Answer 2

I'm extremely new to Python, so I'm sorry if my question is rather stupid. I have a bunch of long strings in one list and shortened parts of it in another list

Like:

Long string is D:\\Python\\Songs\\testsong.mp3 and short string is \\testsong.mp3

And I want to get a list containing 'Songs' (basically the name of the folder containing the mp3) but I have multiple folders and multiple songs so I'm trying to use re.findall but it only accepts defined patterns and my patterns change due to different songs names.