Authentication Implementation in Python
From the Flask cheat sheet · Authentication · verified Jul 2026
Authentication Implementation
User login and session management
python
# Quick Reference
from flask_login import LoginManager, login_user, logout_user
login_manager = LoginManager(app)
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
@app.route('/login', methods=['POST'])
def login():
user = authenticate_user()
login_user(user)
return redirect('/')🔒 Always hash passwords with werkzeug.security
💡 Use Flask-Login for session management
🔍 JWT tokens for API authentication
⚡ @login_required decorator protects routes
authenticationsecurity