How to get absolute path of root directory from anywhere within the directory in python

Question

Let's say I have the following directory

model_folder | | ------- model_modules | | | ---- __init__.py | | | ---- foo.py | | | ---- bar.py | | ------- research | | | ----- training.ipynb | | | ----- eda.ipynb | | ------- main.py

and I want to import model_modules into a script in research

I can do that with the following

import sys sys.path.append('/absolute/path/model_folder') from model_modules.foo import Foo from model_modules.bar import Bar

However, let's say I don't explicitly know the absolute path of the root, or perhaps just don't want to hardcode it as it may change locations. How could I get the absolute path of module_folder from anywhere in the directory so I could do something like this?

import sys sys.path.append(root) from model_modules.foo import Foo from model_modules.bar import Bar

I referred to this question in which one of the answers recommends adding the following to the root directory, like so:

utils.py from pathlib import Path def get_project_root() -> Path: return Path(__file__).parent.parent

model_folder | | ------- model_modules | | | ---- __init__.py | | | ---- foo.py | | | ---- bar.py | | | ------- src | | | ---- utils.py | | | | | ------- research | | | ----- training.ipynb | | | ----- eda.ipynb | | ------- main.py

But then when I try to import this into a script in a subdirectory, like training.ipynb, I get an error

from src.utils import get_project_root root = get_project_root ModuleNotFoundError: No module named 'src'

So my question is, how can I get the absolute path to the root directory from anywhere within the directory in python?

A good solution would be to add model_folder to your $PYTHONPATH environment variable. Then you can import any of its subdirectories without worry. — John Gordon
– John Gordon, Commented Nov 22, 2022 at 23:02

user3435121 · Accepted Answer · 2022-11-22 23:58:19Z

sys.path[0] contain your root directory (the directory where the program is located). You can use that to add your sub-directories.

import sys sys.path.append( sys.path[0] + "/model_modules") import foo

and for cases where foo.py may exist elsewhere:

import sys sys.path.insert( 1, sys.path[0] + "/model_modules") # put near front of list import foo

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