Python 使用flask初始化数据库

我有以下代码：

from realProject import db, create_app
db.create_all(app=create_app())

init.py:

"""Initialize app."""
from flask import Flask
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()


def create_app():
    """Construct the core application."""
    app = Flask(__name__, instance_relative_config=False)

    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite'

    app.config['RECAPTCHA_PUBLIC_KEY'] = '6LcmEeoUAAAAAIbdhgkFBvz676UCRJMjnSx8H6zy'
    app.config['RECAPTCHA_PARAMETERS'] = {'size': '100%'}

    db.init_app(app)

    # blueprint for auth routes in our app
    from .auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint)

    # blueprint for non-auth parts of app
    from .__main__ import main as main_blueprint
    app.register_blueprint(main_blueprint)

    with app.app_context():
        # Import parts of our application
        from . import routes

        return app

我尝试用以下代码初始化数据库：

from realProject import db, create_app
db.create_all(app=create_app())

所有脚本都在realProject文件夹中 但在尝试编译最后一段代码时，我遇到以下错误：

ModuleNotFoundError: No module named 'realProject'

---

我做错了什么？

您需要遵循以下结构：

|__project_name 
     |__app.py                    ----------> The main file from where you run your app 
     |__app     -----> This is the app folder
        ├── templates
        │   └── index.html
        └── __init__.py             -----------> The __init__.py should be inside the app folder for it to be imported
        └── routes.py

然后在主文件中执行以下操作：

from app import db, create_app

db.create_all(app=create_app())

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你这到底是什么意思？