[Python] How do i run this minimal flask code without getting errors on my windows

The name of my python file is 'app.py' This is my code so far:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
return "Hello, World!"


This is how I ran it on my terminal:

set FLASK_APP-app.py
flask run


This is the output I got:

Error: Could not locate a Flask application. Use the 'flask --app' option, 'FLASK_APP' environment variable, or a 'wsgi.py' or 'app.py' file in the current directory.


How do I go about this.

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