dir_setup.py

#!/usr/bin/env python
# coding: utf-8

import os

# Directory set up
my_project_root_path = input('PROJECT_ROOT_PATH = ? >>  ')

PROJECT_ROOT_PATH = my_project_root_path
SOURCE_PATH = os.path.join(PROJECT_ROOT_PATH, 'source')
OUTPUT_PATH = os.path.join(PROJECT_ROOT_PATH, 'output')

if not os.path.isdir(SOURCE_PATH):
    os.makedirs(SOURCE_PATH)
if not os.path.isdir(OUTPUT_PATH):
    os.makedirs(OUTPUT_PATH)

print('\nProject Root path: ', PROJECT_ROOT_PATH)
print('Source path      : ', SOURCE_PATH)
print('Output Path      : ', OUTPUT_PATH)

print('\nFiles in the SP  : ', os.listdir(SOURCE_PATH))
print('Files in the OP  : ', os.listdir(OUTPUT_PATH))