《Flask web开发》第七章一直报错

问题描述

第六章的hello.py还可以正常运行，一到第7章就报错

相关代码

manage.py代码

import os
from app import create_app, db
from flask_script import Manager, Shell
from flask_migrate import Migrate, MigrateCommand
app = create_app(os.getenv('FLASK_CONFIG') or 'default')
manager = Manager(app)
migrate = Migrate(app, db)
def make_shell_context():
    return dict(app=app, db=db, User=User, Role=Role)
manager.add_command("shell", Shell(make_context=make_shell_context))
manager.add_command('db', MigrateCommand)
@manager.command
def test():
    """Run the unit tests."""
    import unittest
    tests = unittest.TestLoader().discover('tests')
    unittest.TextTestRunner(verbosity=2).run(tests)
if __name__ == '__main__':
    manager.run()

__init__.py代码

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from flask_mail import Mail
from flask_moment import Moment
from flask_sqlalchemy import SQLAlchemy
from config import config
bootstrap = Bootstrap()
mail = Mail()
moment = Moment()
db = SQLAlchemy()
def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)
    bootstrap.init_app(app)
    mail.init_app(app)
    moment.init_app(app)
    db.init_app(app)
    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)
    # 附加路由和自定义的错误页面
    return app

views.py代码

from datetime import datetime
from flask import render_template, session, redirect, url_for
from . import main
from .forms import NameForm
from .. import db
from ..models import User
@main.route('/', methods=['GET', 'POST'])
def index():
    form = NameForm()
    if form.validate_on_submit():
        # ...
        return redirect(url_for('.index'))
    return render_template('index.html',
                           form=form, name=session.get('name'),
                           known=session.get('known', False),
                           current_time=datetime.utcnow())

文件结构如下图
《Flask web开发》第七章一直报错
错误如下

flask.cli.NoAppException: While importing "manage", an ImportError was raised:
Traceback (most recent call last):
  File "/home/gqc/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
  File "/home/gqc/flasky/manage.py", line 6, in <module>
    app = create_app(os.getenv('FLASK_CONFIG') or 'default')
  File "/home/gqc/flasky/app/__init__.py", line 24, in create_app
    from .main import main as main_blueprint
  File "/home/gqc/flasky/app/main/__init__.py", line 5, in <module>
    from . import views, errors
  File "/home/gqc/flasky/app/main/views.py", line 5, in <module>
    from .forms import NameForm
ImportError: cannot import name 'NameForm'

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