Suggested Certification for Flask

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Interview Questions and Answers

You create a blueprint using the `Blueprint` class from the `flask` module: python from flask import Blueprint, render_template auth_bp = Blueprint(auth, __name__, template_folder=templates/auth) @auth_bp.route(/login) def login(): return render_template(login.html) Then, you register the blueprint with your application using `app.register_blueprint(auth_bp)`. `template_folder` is optional but recommended for blueprint specific templates.

Deployment depends on your desired hosting environment. Common options include using a WSGI server like Gunicorn or uWSGI with a reverse proxy like Nginx, or deploying to platforms like Heroku, AWS Elastic Beanstalk, or Google App Engine. Each platform has its specific configuration requirements.

Some popular Flask extensions include: * Flask-SQLAlchemy: Integrates SQLAlchemy for database interaction. * Flask-WTF: Simplifies form handling and validation with WTForms. * Flask-Migrate: Handles database schema migrations using Alembic. * Flask-Login: Manages user authentication. * Flask-RESTful: Builds REST APIs. * Flask-Mail: Sends emails.

Place your static files in a folder named `static` in your application directory. You can then reference these files in your HTML templates using the `url_for()` function: html

Flask blueprints are a way to organize a large Flask application into reusable components. They allow you to group related views, templates, and static files into separate modules, improving code organization and maintainability. You should use them when your application becomes large and complex.

To use sessions, you need to configure a secret key for your Flask application. Then, you can store and retrieve data from the session using `session[key] = value` and `session.get(key)`: python from flask import Flask, session app = Flask(__name__) app.secret_key = your_secret_key @app.route(/set_session) def set_session(): session[username] = example_user return Session set! @app.route(/get_session) def get_session(): username = session.get(username) return fUsername: {username} if username else No username in session

`app.config[SECRET_KEY]` is used to encrypt the session data, making it secure. Its crucial to set a strong, random secret key for production environments.

`request.method` is an attribute of the `request` object that contains the HTTP method used for the request (e.g., GET, POST, PUT, DELETE). Its used to determine how to handle the incoming request.

Use the `redirect()` function from the `flask` module along with the `url_for()` function to generate the URL for the target route: python from flask import Flask, redirect, url_for app = Flask(__name__) @app.route(/success) def success(): return logged in successfully @app.route(/login) def login(): return redirect(url_for(success))

`url_for()` is a function in Flask that generates a URL to a specific function (view) based on its name. This is useful because it allows you to change the URL structure of your application without having to update all the links in your templates.

You can use HTML forms and access the form data using `request.form` in your Flask route. Youll typically use a library like WTForms for more robust form handling and validation. python from flask import Flask, request, render_template app = Flask(__name__) @app.route(/login, methods=[GET, POST]) def login(): if request.method == POST: username = request.form[username] password = request.form[password] # Process login information return Login successful! return render_template(login.html)