export flask app

1$ export FLASK_APP=hello.py
2$ python -m flask run
3 * Running on http://127.0.0.1:5000/
4

1# Extremely simple flask application, will display 'Hello World!' on the screen when you run it
2# Access it by running it, then going to whatever port its running on (It'll say which port it's running on).
3from flask import Flask
4app = Flask(__name__)
5
6@app.route('/')
7def hello_world():
8    return 'Hello, World!'
9
10if __name__ == '__main__':
11    app.run()

1> set FLASK_APP=hello
2> flask run
3