How do you implement authentication in Python apps?

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Flask is a lightweight, easy-to-use web framework for building web applications in Python. It's classified as a microframework because it provides the essential tools to get a simple web application up and running but leaves the developer free to choose additional components and libraries for more advanced functionality. This flexibility makes Flask ideal for both small projects and more complex applications.

 Use a Web Framework

Popular frameworks like Flask or Django have built-in or extension support for authentication.

 Basic Authentication Flow

  • User Registration: Collect username and password, then store the password securely using hashing (e.g., bcrypt).

  • Login: Verify user credentials by comparing the entered password (hashed) with the stored hash.

  • Session Management: Maintain user login status using sessions or tokens.

  • Access Control: Restrict pages or API endpoints to authenticated users only.

Use Token-Based Authentication (e.g., JWT)

  • Common for APIs.

  • After login, issue a JWT token.

  • Clients send token with each request.

  • Server verifies token to authorize.

 Security Best Practices

  • Always hash passwords securely (e.g., bcrypt).

  • Use HTTPS to protect credentials in transit.

  • Implement account lockout or CAPTCHA after repeated failed attempts.

  • Store tokens securely on the client side.

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