Flask with envvars

.env

SECRET_KEY = '2a057dd2f0844f5a928578032c5b9955'
DB_URL = 'postgresql+psycopg2://postgres:######@127.0.0.1/so_test'

__init__.py

from flask import Flask

from config import Config


def create_app():
    
    app = Flask(__name__)
    app.config.from_object(Config)
    
    # Other stuff
    
    return app

config.py

import os
import uuid

from dotenv import load_dotenv

basedir = os.path.abspath(os.path.dirname(__file__))
load_dotenv(os.path.join(basedir, '.env'))


class Config:
    
    SECRET_KEY = os.environ.get('SECRET_KEY', uuid.uuid4().hex)
    DB_URL = os.environ.get('DB_URL')
    
    # Other general config
    SQLALCHEMY_DATABASE_URI = DB_URL
    
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SESSION_TYPE = 'sqlalchemy'
    SESSION_SQLALCHEMY_TABLE = 'sessions'
    
    SCHEDULER_API_ENABLED = True