我如何在没有收到此错误消息的情况下运行此Flask应用程序？

Question

(venv) -MBP microblog % flask run
 * Serving Flask app "microblog.py"
 * 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]

Error: While importing "microblog", an ImportError was raised:

Traceback (most recent call last):
  File "/Users//microblog/venv/lib/python3.7/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
  File "/Users//microblog/microblog.py", line 1, in <module>
    from app import app
ImportError: cannot import name 'app' from 'app' (unknown location)

我尝试过export FLASK_APP=microblog.py

我也尝试过从多个目录运行它，我不确定这是否有帮助。

谢谢。