How can I implement authentication in a Flask application?

How can I implement authentication in a Flask application?

You can use Flask-Login for user session management. First, install it using pip.

What are the steps to set it up?

1. Install Flask-Login. 2. Create a User model. 3. Set up login and logout routes. 4. Protect routes with a login required decorator.

Can you show me a code example?

Sure! Here's a simple example:

from flask import Flask, redirect, url_for, request
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user

app = Flask(__name__)
app.secret_key = 'your_secret_key'
login_manager = LoginManager()
login_manager.init_app(app)

class User(UserMixin):
    # User model implementation

@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)

# Add routes for login, logout, etc.