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如何在烧瓶应用程序中使用 FlaskCLivirtualenv

我创建了一个名为 app 的文件夹并激活了 virtualenv 并创建了一个app.py包含以下内容的文件

from flask import Flask 
from flask_cli import FlaskCLI

app = Flask('hello')
FlaskCLI(app)

@app.cli.command()
def initdb():
    print ("Creating a database ")

然后我使用了命令export FLASK_APP=app.py然后flask run但得到了错误

 * Serving Flask app 'hello.py' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
Usage: flask run [OPTIONS]
Try 'flask run --help' for help.

Error: While importing 'hello', an ImportError was raised:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/flask/cli.py", line 256, in locate_app
    __import__(module_name)
  File "/home/kali/Desktop/Hermes/hello.py", line 5, in <module>
    from flask_cli import FlaskCLI
ModuleNotFoundError: No module named 'flask_cli'

这就是我安装软件包的方式

pip3 install flask-cli   
Requirement already satisfied: flask-cli in ./lib/python3.9/site-packages (0.4.0)
Requirement already satisfied: click>=2.0 in ./lib/python3.9/site-packages (from flask-cli) (8.0.4)
Requirement already satisfied: Flask>=0.10 in ./lib/python3.9/site-packages (from flask-cli) (2.0.3)
Requirement already satisfied: Jinja2>=3.0 in ./lib/python3.9/site-packages (from Flask>=0.10->flask-cli) (3.0.3)
Requirement already satisfied: itsdangerous>=2.0 in ./lib/python3.9/site-packages (from Flask>=0.10->flask-cli) (2.1.0)
Requirement already satisfied: Werkzeug>=2.0 in ./lib/python3.9/site-packages (from Flask>=0.10->flask-cli) (2.0.3)
Requirement already satisfied: MarkupSafe>=2.0 in ./lib/python3.9/site-packages (from Jinja2>=3.0->Flask>=0.10->flask-cli) (2.1.0)
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