python from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return 'Hello, Flask!' if __name__ == '__main__': app.run() python @app.route('/user/<name>') def greet_user(name): return f'Hello, {name}!' @app.route('/post/<int:post_id>') def get_post(post_id): return f'This is post {post_id}.' python from flask import Flask, render_template app = Flask(__name__) @app.route('/') def index(): return render_template('index.html') @app.route('/post/<int:post_id>') def show_post(post_id): # ... return render_template('post.html', post_id=post_id) @app.route('/user/<username>') def show_user(username): # ... return render_template('user.html', username=username) if __name__ == '__main__': app.run() python app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data.db' app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False app.config['SECRET_KEY'] = 'supersecretkey' app.config['DEBUG'] = True