Convert a relative path (mp3) from a master file path (playlist) using python pathlib

Question

I have three files

My python file running in an unimportant different folder: C:DDCCBBAAcode.py
A playlist file "C:ZZXXPlaylist.pls" which points to ….mp3song.mp3
The C:mp3song.mp3 file.

What I want is to get the location of the mp3 as an absolute path. But every attemp I try I get everything related to whenever the code.py file is.

import pathlib
plMaster = pathlib.Path(r"C:ZZXXPlaylist.pls")
plSlave = pathlib.Path(r"....mp3song.mp3")

I have tried plSlave.absolute() and gives me "C:DDCCBBAA….mp3song.mp3"
Using relative_to doesn’t work. I feel like I am doing such an easy task but I must be missing something because I can’t find any function that lets me set the reference to compute the relative path.

Note: I already have parsed the pls file, and have the string r"….mp3song.mp3" extracted. I just need to get the path "C:mp3song.mp3" knowing that they are relative to the pls. (Not relative to the code.py)

Asked By: Ricardo

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Source

Answer 1

If you’re using a Windows version of Python, this is fairly easy. You can join the directory of plMaster (plMaster.parent) with the relative path of plSlave, then resolve the path using resolve(). You can use strict=False to force the resolve even if the path components aren’t found.

This worked for me:

>>> plMaster = pathlib.Path(r"C:ZZXXPlaylist.pls")
>>> plSlave = pathlib.Path(r"....mp3song.mp3")
>>> plMaster.parent.joinpath(plSlave).resolve(strict=False)
WindowsPath('C:/mp3/song.mp3')

If you’re on a Unix version of Python, using Windows paths, I couldn’t get this to work no matter what I tried, even using pathlib.PureWindowsPath().

Answered By: sj95126

Answer 2

Might well be a better method here, but you can use pathlib.Path.parents and pathlib.Path.parts to extract some useful info here and get where you are going

new_relative_path = r"....mp3song.mp3" #however you got this from reading your .pls file or whatever
pls_path = pathlib.Path(r'C:ZZXXPlaylist.pls')
relative_save = pathlib.Path(new_relativePath)

n = relative_save.parts.count('..')

new_path = pls_path.parents[n-1].joinpath(*relative_save.parts[n:])

The key thing here is that you are going to navigate up the original path (the pls_path) n times (so n-1 since we start at 0), and then you are going to append to that whatever your new relative path is, stripping the '..' segments from the beginning of it.

Answered By: scotscotmcc

Answer 3

Whilst I was waiting for other answers I manage to figure it out ditching pathlib and using os instead.

import os
plMaster = r"C:ZZXXPlaylist.pls"
plSlave = r"....mp3song.mp3"
os.chdir(os.path.dirname(plMaster))
os.path.abspath(plSlave)

Answered By: Ricardo

Convert a relative path (mp3) from a master file path (playlist) using python pathlib

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