La aplicación Flask no lanzará 'ImportError: no se puede importar el nombre' cached_property 'desde' werkzeug ''

He estado trabajando en una aplicación Flask durante algunas semanas. Lo terminé hoy y fui a implementarlo ... y ahora no se iniciará.

No agregué ni eliminé ningún código, ¿asumo que algo ha cambiado en el proceso de implementación?

De todos modos, aquí está el error completo que se muestra en la terminal:

Traceback (most recent call last):
  File "C:\Users\Kev\Documents\Projects\Docket\manage.py", line 5, in <module>
    from app import create_app, db
  File "C:\Users\Kev\Documents\Projects\Docket\app\__init__.py", line 21, in <module>
    from app.api import api, blueprint, limiter
  File "C:\Users\Kev\Documents\Projects\Docket\app\api\__init__.py", line 2, in <module>
    from flask_restplus import Api
  File "C:\Users\Kev\.virtualenvs\Docket-LasDxOWU\lib\site-packages\flask_restplus\__init_
_.py", line 4, in <module>
    from . import fields, reqparse, apidoc, inputs, cors
  File "C:\Users\Kev\.virtualenvs\Docket-LasDxOWU\lib\site-packages\flask_restplus\fields.
py", line 17, in <module>
    from werkzeug import cached_property
ImportError: cannot import name 'cached_property' from 'werkzeug' (C:\Users\Kev\.virtualen
vs\Docket-LasDxOWU\lib\site-packages\werkzeug\__init__.py)

También aquí está el código en los tres archivos mencionados.

manage.py:

from apscheduler.schedulers.background import BackgroundScheduler
from flask_script import Manager
from flask_migrate import Migrate, MigrateCommand

from app import create_app, db

app = create_app()
app.app_context().push()

manager = Manager(app)

migrate = Migrate(app, db)

manager.add_command('db', MigrateCommand)

from app.routes import *
from app.models import *

def clear_data():
    with app.app_context():
        db.session.query(User).delete()
        db.session.query(Todo).delete()
        db.session.commit()
        print("Deleted table rows!")

@manager.command
def run():
    scheduler = BackgroundScheduler()
    scheduler.add_job(clear_data, trigger='interval', minutes=15)
    scheduler.start()
    app.run(debug=True)

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

app/__init__.py:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager

from config import Config

db = SQLAlchemy()

login = LoginManager()

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

    login.init_app(app)
    login.login_view = 'login'

    from app.api import api, blueprint, limiter
    from app.api.endpoints import users, todos, register
    from app.api.endpoints.todos import TodosNS
    from app.api.endpoints.users import UserNS
    from app.api.endpoints.register import RegisterNS

    api.init_app(app)

    app.register_blueprint(blueprint)

    limiter.init_app(app)

    api.add_namespace(TodosNS)
    api.add_namespace(UserNS)
    api.add_namespace(RegisterNS)

    return app

api/__init__.py:

from logging import StreamHandler
from flask_restplus import Api
from flask import Blueprint
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address

blueprint = Blueprint('api', __name__, url_prefix='/api')

limiter = Limiter(key_func=get_remote_address)
limiter.logger.addHandler(StreamHandler())

api = Api(blueprint, doc='/documentation', version='1.0', title='Docket API',
          description='API for Docket. Create users and todo items through a REST API.\n'
                      'First of all, begin by registering a new user via the registration form in the web interface.\n'
                      'Or via a `POST` request to the `/Register/` end point', decorators=[limiter.limit("50/day", error_message="API request limit has been reached (50 per day)")])

He intentado reinstalar flasky flask_restplussin suerte.

Tratar:

from werkzeug.utils import cached_property

https://werkzeug.palletsprojects.com/en/1.0.x/utils/

Bajar de categoría a Werkzeug == 0.16.1 resuelve esto

ver https://github.com/noirbizarre/flask-restplus/issues/777#issuecomment-583235327