Python 烧瓶命令出错'；单击'；没有定义

我正在创建一个简单的Flask应用程序，这是我的文件夹结构：

.
├── app
│   ├── flaskr
│   │   ├── db.py
│   │   ├── __init__.py
│   │   └── usio.sql
│   ├── templates
│   │   ├── historical.html
│   │   └── index.html
│   ├── test_usio.py
│   ├── usio.db
│   ├── usio.json
│   ├── usio.py
│   ├── usio.sql
│   └── wsgi.py
├── logs
│   └── nginx
│       ├── access.log
│       └── error.log
├── usio.db
├── usio.json
└── usio.sql

在我的

db.py

文件中，我有以下代码：

def init_db():
    db = get_db()

    with current_app.open_resource('usio.sql') as f:
        db.executescript(f.read().decode('utf8'))

@click.command('init-db')
@with_appcontext
def init_db_command():
    """Clear the existing data and create new tables."""
    init_db()
    click.echo('Initialized the database.')

def init_app(app):
    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)

我正在学习这个教程

我的烧瓶版本是1.0.2

但是，当我尝试此命令时，它会从

flaskr

文件夹中抛出以下命令：

Traceback (most recent call last):
File "/home/kristian/.virtualenvs/usio_flask/bin/flask", line 11, in <module>
sys.exit(main())
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/flask/cli.py", line 894, in main
cli.main(args=args, prog_name=name)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/flask/cli.py", line 557, in main
return super(FlaskGroup, self).main(*args, **kwargs)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/click/core.py", line 1061, in invoke
cmd_name, cmd, args = self.resolve_command(ctx, args)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/click/core.py", line 1100, in resolve_command
cmd = self.get_command(ctx, cmd_name)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/flask/cli.py", line 515, in get_command
rv = info.load_app().cli.get_command(ctx, name)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/flask/cli.py", line 372, in load_app
app = locate_app(self, import_name, name)
File "/home/kristian/.virtualenvs/usio_flask/lib/python3.4/site-packages/flask/cli.py", line 235, in locate_app
__import__(module_name)
 File "/home/kristian/usio/usio/app/flaskr/db.py", line 7, in <module>
@click.command('init-db')
NameError: name 'click' is not defined

此外，在尝试

flask init db

命令之前，我将自己定位在

flaskr

文件夹中，在运行该命令之前，我也会使用它

export=flask\u APP=db

---

有什么想法吗？

您缺少

导入，请单击教程中的

def create_app():
    app = ...
    # existing code omitted

    from . import db
    db.init_app(app)

    return app