[Python] How to log/display app name, host and port upon startup?

In my simple Flask app, I've created the following .flaskenv file:

FLASK_APP=simpleflask.app
FLASK_RUN_HOST=127.0.0.1
FLASK_RUN_PORT=60210


Now, I would like my app to log the following message upon startup:

Running my.flask.app on http://127.0.0.1:60210 ...


The message should be logged just once, not per each request.

Preferably, I would like to avoid parsing .flaskenv on my own, but rather use some internal Flask objects and obtain this information dynamically.

Any idea how to achieve this?

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