Flask Interview Questions and Answers
Ques 16. Explain the thread-local Flask object?
Thread local Flask objects are mostly available in a valid request context. Because of this, we don’t need to pass objects from one method to another. Because in Flask thread safety is declared out of the box. We can access the objects by a command like the current _app.
Ques 17. Wwhy we need to use Flask, not Django?
Flask is a better quick development Python framework. It uses cases and perfects prototyping. It is better for lightweight web applications. It is best to develop microservice and server-less applications. In comparison, it has full features that are built-in. Flask is also easy to learn with so many APIs. In Django, there are fewer APIs.
Ques 18. What are the features of forms extension in Flask?
We have to use the Flask- extension to implement forms in Flask. It’s called WTForms. It’s a Python-based rendering and validation library. It does data validation, CSRF protection, and internationalization. Once we use Flask-uploads, ReCaptcha from Flask-WTF helps to upload files. We can also manage JavaScript requests and customization of error responses.
Ques 19. Explain the G object in Flask?
If we want to hold any data during the application context, the Flask g object is used as a global namespace for keeping any data. It’s not suitable for storing data within requests. Actually, this letter g stands for global. Suppose we need to store a global variable in an application context, then g object is best in place of creating global variables. Here the g object will work as a request in a separate Flask g object. It always saves self-defined global variables.
Ques 20. What is the application context in Flask?
It is the basic idea to complete the response circle in the Flask application. During any request of the CLI command, it maintains all track of application-level data. We can use g object or current _app to access those data. Always Flask forced application context with every request to complete the circle.
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