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Your first Flask app

In this first application, we will make sure Flask is working correctly.

• Make a new folder somewhere to hold all your Flask applications. Call it something like flask-apps.
• In that folder, make a sub-folder called first.
• Start up Spyder and create a new file called app.py.
• Inside this file, put the following code:

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

• Let's go through this line by line.
• Line 1: This imports the flask package.
• Line 2: This makes a new flask application and puts it into the app variable.