$ python manage.py runserver
Traceback (most recent call last):
  File "manage.py", line 5, in <module>
    from app import app, db
  File "C:a1wordcountapp.py", line 7, in <module>
    app.config.from_object(os.environ['APP_SETTINGS'])
  File "C:UsersUserAppDataLocalProgramsPythonPython36-32libos.py", line 669, in __getitem__
    raise KeyError(key) from None
KeyError: 'APP_SETTINGS'

from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
import os


app = Flask(__name__)
app.config.from_object(os.environ['APP_SETTINGS'])
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)

from models import Result

@app.route('/', methods=['GET', 'POST'])
def index():
    return render_template('index.html')

if __name__ == '__main__':
    app.run()

import os
from flask_script import Manager
from flask_migrate import Migrate, MigrateCommand

from app import app, db


app.config.from_object(os.environ['APP_SETTINGS'])

migrate = Migrate(app, db)
manager = Manager(app)

manager.add_command('db', MigrateCommand)


if __name__ == '__main__':
    manager.run()