Файлы

import os

# Полный путь к текущему файлу
current_file_path = os.path.abspath(__file__)

# Где находится текущий файл
current_dir = os.path.dirname(current_file_path)

# На уровень выше соответственно
parent_dir = os.path.dirname(current_dir)

dir = os.path.join(current_dir, config.docs_dir_name)

start_directory = 'Тут начальный путь'

# os.walk() возвращает генератор
for current_path, subdirectories, files in os.walk(start_directory):
    for file in files:
        print(os.path.join(current_path, file))

from pathlib import Path

folder_path = Path(...)

for file_path in folder_path.rglob("*"):
    if file_path.is_file():
        print(file_path)

from pathlib import Path
Path("folder/file.txt").stem   # 'file'

for p in Path("my_dir").iterdir():
    if p.is_file():
        print(p)

import tomllib
with open("pyproject.toml", "rb") as f:
    data = tomllib.load(f)
deps = data.get("dependencies", [])

import tomllib
with open("pyproject.toml", "rb") as f:
    data = tomllib.load(f)
with open("requirements.txt", "w") as f:
    for dep in data.get("dependencies", []):
        f.write(dep + "\n")

from dotenv import set_key
set_key(".env", "TASK", "123")

from dotenv import load_dotenv
import os
load_dotenv()
task = os.getenv("TASK")