Imports in Python using Flask-CodePudding

I keep getting this error when trying to import my app and app.models.

Traceback (most recent call last): File "tools.py", line 3, in from app import db ModuleNotFoundError: No module named 'app'

Here is my tools.py file

import psycopg2
import os
from app import db
from app.models import UpdateLogs

...rest of file...

app/
   api/
      __init__.py
      ...
   db_tools/
      __init__.py
      tools.py
   errors/
      __init__.py
      ...
   __init__.py
   models.py

What gives? The /db_tools folder is structured just like app/api and app/errors.

/db_tools/init.py

from flask import Blueprint

bp = Blueprint('db_tools', __name__)

from app.db_tools import tools

app/init.py

import logging
from logging.handlers import SMTPHandler, RotatingFileHandler
import os
from config import Config
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_cors import CORS


db = SQLAlchemy()
migrate = Migrate()
cors = CORS()


def create_app(config_class=Config):
    app = Flask(__name__)
    app.config.from_object(config_class)

    db.init_app(app)
    migrate.init_app(app, db)
    cors.init_app(app)


    from app.api import bp as api_bp
    app.register_blueprint(api_bp, url_prefix='/api')

    from app.errors import bp as errors_bp
    app.register_blueprint(errors_bp)

    from app.db_tools import bp as db_tools_bp
    app.register_blueprint(db_tools_bp)

    if not app.debug and not app.testing:
        if app.config['LOG_TO_STDOUT']:
            stream_handler = logging.StreamHandler()
            stream_handler.setLevel(logging.INFO)
            app.logger.addHandler(stream_handler)

        else:
            if not os.path.exists('logs'):
                os.mkdir('logs')
            file_handler = RotatingFileHandler('logs/kanjiremastered.log',
                                            maxBytes=10240, backupCount=10)
            file_handler.setFormatter(logging.Formatter(
                '%(asctime)s %(levelname)s: %(message)s '
                '[in %(pathname)s:%(lineno)d]'))
            file_handler.setLevel(logging.INFO)
            app.logger.addHandler(file_handler)

        app.logger.setLevel(logging.INFO)
        app.logger.info('Flask app startup')

    return app


from app import models

CodePudding user response：

There is no db in app directory or in app\__init__.py so how can you import db from app? hence the error.

CodePudding user response：

You are trying to get db from the app package, but there is nothing called db. so your folder structure should include db

app/
   api/
      __init__.py
      ...
   db_tools/
      __init__.py
      tools.py
   errors/
      __init__.py
      ...
   __init__.py
   db.py     <----------------------------
   models.py

Now, if you want to get the object db created in app/__init__ (db = SQLAlchemy()) that is something different. For this, you will need to design the code in a different way.

Not sure what are you using in tool.py that required an object db so I cannot be more specific.