How do I rewrite this .bat file code onto Python?

[SteampunkMaverick12]

set APPDATA=%CD%\data
bin\minecraft.exe

don't ask why

[Larz60+]

first, by giving it a try,
and if unsuccessful then asking questions.

[SteampunkMaverick12]

first, by giving it a try,
and if unsuccessful then asking questions.

thing is ie already tried 2 methods using os and subprocess I found on reddit

[Axel_Erfurt]

show it.

[snippsat]

thing is ie already tried 2 methods using os and subprocess I found on reddit

As mention you should show what you tired,it also help if understand what code dos
set is setting environment variable for current session.
%CD% get current working directory,in python os.getcwd().
As bin\minecraft.exe is on a new line means that running minecraft.exe with environment in set.
So then it could be like this.

import subprocess, os

d = dict(os.environ)
d['APPDATA'] = f'{os.getcwd()}\\data'
subprocess.run(['bin\minecraft.exe'], env=d)