Creating database file one directory above current

In PHP, To refer to a higher directory I would use '../../test'; How would I do it in Python?

In this case, I'm using SQLite to create a database file.

import sqlite3
conn = sqlite3.connect('../data/test.db')

However; it says 'unable to open database file' which I'm considering as a directory access error. How do I refer to higher directory in Python?