Student Lab Learning Guide - Front-End Your 3-Tier Model-View-Controller Applications with Python Flask

In this lab, you will learn how to front-end your 3-tier Model-View-Controller (MVC) applications with a Python Flask web server. Flask is a lightweight and flexible web framework that allows you to build web applications quickly and easily. By the end of this lab, you will be able to set up a Flask web server and integrate it with your Python MVC applications.

Basic knowledge of Python programming
Understanding of the MVC architectural pattern

Lab Steps:

Step 1: Install Flask

Open your preferred Python development environment or editor.
Install the Flask library using the following command:
pip install flask

Step 2: Set Up Your Flask Application

Create a new Python file for your Flask application, e.g.,
Import the Flask class from the Flask library:
from flask import Flask

Create an instance of the Flask class:
app = Flask(__name__)

Step 3: Define Routes and Views

Decorate a Python function with the @app.route() decorator to define a route for your web application. For example, to define a route for the home page:
def home():
return 'Welcome to my Flask app!'

Define additional routes and views as needed for your MVC application. Each view should return the appropriate HTML, templates, or JSON responses based on the requested route.

Step 4: Run the Flask Web Server

Add the following code at the end of your file to run the Flask web server:
if __name__ == '__main__':

Save the file and run it from your terminal or command prompt using the following command:

Open your web browser and visit http://localhost:5000 to see your Flask application in action.

Step 5: Integrate with Your MVC Application

Import the necessary modules and components from your MVC application into your Flask application file (
Use the routes defined in your Flask application to call the appropriate controller methods and retrieve data from your model.

Step 6: Expand Your Flask Application

Explore Flask's features and functionality to enhance your web application. You can:
Use templates to render dynamic HTML pages.
Handle form submissions and user input.
Access and modify databases using Flask extensions like Flask-SQLAlchemy or Flask-MongoEngine.
Implement authentication and authorization using Flask-Login or Flask-JWT.

Congratulations! You have successfully front-ended your 3-tier Model-View-Controller (MVC) applications with a Python Flask web server. Flask provides a simple and efficient way to build web interfaces for your Python applications. By integrating Flask with your MVC architecture, you can create powerful and interactive web applications.

Remember to follow best practices for web development, including proper error handling, security measures, and code organization. Flask's extensive documentation can help you further explore its capabilities and build even more sophisticated web applications.

Happy coding and enjoy exploring the world of Python Flask!

Additional Resources:

Flask Documentation:
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