Have you had experience with user authentication mechanisms?

Yes, I have experience working with various user authentication mechanisms in Python. For example, I have used libraries like Flask-Login and Django Authentication to implement authentication in web applications. I am also familiar with OAuth 2.0 and JWT (JSON Web Tokens) for creating secure APIs.

Example of using Flask-Login:

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

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

class User(UserMixin):
    def __init__(self, id):
        self.id = id

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

@app.route('/login', methods=['POST'])
def login():
    username = request.form['username']
    password = request.form['password']
    # User verification (e.g., in database)
    if username == 'admin' and password == 'password':
        user = User(id=1)
        login_user(user)
        return redirect(url_for('protected'))
    return 'Invalid credentials', 401

@app.route('/protected')
@login_required
def protected():
    return 'Access granted'

@app.route('/logout')
@login_required
def logout():
    logout_user()
    return 'You have logged out'

if __name__ == '__main__':
    app.run()