If a virtualenv is activated, this will return the full path of the dependency named.

find_venv_dependency.py

import os
import sys


def find_venv_dependency(name):
    if not hasattr(sys, 'real_prefix'):
        return  # venv not activated

    venv = sys.prefix.split('/')[len(os.getcwd().split('/'))]
    for root, dirs, files in os.walk(venv):
        if name in dirs:
            return f'{root}/{name}'