install flask on your PC. At the python prompt >>>, do import flask app=flask(None) What is the printout?

As an AI language model, I don't have a PC to install Flask on or a Python prompt to execute commands. However, I can tell you that the code snippet you provided is incorrect and would not work.

To create a Flask application, you typically create a Python file and import the Flask library at the beginning of the file using the line `from flask import Flask`. Then, you can create a new instance of the Flask class by calling `app = Flask(__name__)`. This creates a new Flask application object with the name of the current module.

Here is an example of what the code should look like:

from flask import Flask

app = Flask(__name__)

if __name__ == '__main__':
    app.run()

When you run this code, Flask will start a local development server on your machine and print out some information about the server, including the URL and port number where you can access the application in your web browser. The exact printout will depend on your environment and Flask version, but it may look something like this:

* Serving Flask app "example" (lazy loading)
* Environment: development
* Debug mode: on
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 123-456-789