Pytest and rootdirectory

[Larz60+]

using os, I usually set my starting directory as the directory containing the script,
then set everything relative from there using pathlib.

the os command I issue during script initialization is:
os.chdir(os.path.abspath(os.path.dirname(__file__)))
then using pathlib, immediately after that:

# add at top with other imports:
from pathlib import Path
...
# somewhere in initialization:
homepath = Path('.')
base_path = homepath / '..' / 'data'

Once this is established, you can set relative paths from there

widgetpath = base_path / 'widgets'

zingo_widgetfile = widgetpath / 'zingo.dat'
with zingo_widgetfile.open() as fp:
    zingodata = fp.read()

etc.