Q:

Python can't find path with Powershell

I have a rather unusual problem. I wrote a python script which needs API keys. Since I don't want them floating around on the internet I created a seperate .json with the keys and added it to .gitignore. So far so good.
I wrote the program with VSCode and there I could execute it no problem. But when I try to use my program with the normal PowerShell it simply won't work. I get this error message when I run it on the external PS: FileNotFoundError: [Errno 2] No such file or directory: './master-folder/key.json'
I use a virtualenv, for the packages but that shouldn't affect anything (of course I activated it in PS). Here's the part of the code once again:
keys_fp = './master-folder/key.json'

keys = load(open(keys_fp, 'r'))

The folder structure is as follows:
.
├── programs
│   └── program.py
└── key.json

A:

Based on your comments, your working directory is
E:\Git\master-folder\programs\

and inside your script, you're referencing 
./master-folder/key.json

which resolves to
E:\Git\master-folder\programs\master-folder\key.json

but that doesn't exist.  If you adjust your script to use the proper path, it should resolve your problem:
keys_fp = f'{os.getcwd()}\\..\\key.json'

According to this answer, you can access the script's root with the following:
import os
root = os.path.dirname(os.path.realpath(__file__))
keys_fp = f'{root}\\..\\key.json'

