flask_app command does not found packages

Currently referring to this tutorial. https://flask.palletsprojects.com/en/1.1.x/tutorial/factory/

The directory folder is as below.

init.py ->

import os    from flask import Flask      def create_app(test_config=None):      # create and configure the app      app = Flask(__name__, instance_relative_config=True)      app.config.from_mapping(          SECRET_KEY='dev',          DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),      )        if test_config is None:          # load the instance config, if it exists, when not testing          app.config.from_pyfile('config.py', silent=True)      else:          # load the test config if passed in          app.config.from_mapping(test_config)        # ensure the instance folder exists      try:          os.makedirs(app.instance_path)      except OSError:          pass        # a simple page that says hello      @app.route('/hello')      def hello():          return 'Hello, World!'        return app  

problem:

try:

1. create app.py and run --> success
   

Question.

Why FLASK_APP can't recognize flask package? What should I do?

https://stackoverflow.com/questions/66501636/flask-app-command-does-not-found-packages March 06, 2021 at 09:51AM