In this tutorial, we will create a simple hello world website using the Python Flask framework. Please follow the step by step guide to create your first flask application.

Create a Flask Application

Now, let’s create a directory for your project and create a Python file for your Flask application. You can name this file, for example, app.py.

Write Your First Flask Application

In your app.py file, write the following code to create a simple Flask application:

This code does the following:

• It imports the Flask class from the Flask library.
• It creates an instance of the Flask class called app.
• It defines a route (“/”) and a function (hello_world) to handle requests to that route. In this case, it returns the text “Hello, Flask!” as a response.

Run Your Flask Application

To run your Flask application, open your terminal or command prompt, navigate to the directory containing app.py, and run the following command:

You should see output indicating that your Flask app is running, and it will provide a URL (usually http://127.0.0.1:5000/) where your app is accessible.

Access Your Flask Application

Open a web browser and enter the URL provided in the terminal (e.g., http://127.0.0.1:5000/).

You should see the message “Hello, Flask!” displayed in your browser. Congratulations! You’ve created and run your first Flask web application.

Conclusion:

In this tutorial, you’ve taken your first steps into the world of Flask web development. You’ve learned how to set up Flask, create a simple web application, and run it locally.

In this flask installation tutorial I will guide you through how to install Flask, a popular Python web framework:

Step 1: Prerequisites:

Before you start Flask installation, make sure you have Python installed on your system. Flask works seamlessly with Python 3.5 and newer versions.

Step 2: Virtual Environment (Optional but Recommended):

In order to maintain a clean and organized development environment, It’s a good practice to create a virtual environment for your Flask projects. This step isn’t mandatory but is highly recommended as it keep dependencies isolated. Let’s begin by running following commands in your terminal or command prompt:

• On Windows:

• On macOS and Linux:

Confirm that your terminal prompt displays your virtual environment name, indicating that it’s active. Replace “myenv” with your preferred virtual environment name.

Step 3: Activate the Virtual Environment:

Activate your virtual environment to isolate dependencies. Use these commands:

• On Windows:

• On macOS and Linux:

Step 4: Install Flask:

With your virtual environment in place, proceed to install Flask and its prerequisites. Run the following command:

Step 5: Verify Flask Installation:

Now we check that Flask has been installed correctly in our system by running:

This command should display the installed Flask version.

Step 6: Create a Flask App:

You’re now ready to create your Flask web applications. Begin by setting up a new directory for your project and creating a Python file within it (e.g., app.py) for your Flask application.

Step 7: Write a Simple Flask App:

In your app.py file, create a basic Flask application. Here’s a minimal example:

Step 8: Run Your Flask App:

To start your Flask app, use this command from your terminal (ensure you’re in the project directory with app.py):

Now, access your app in web browser at http://localhost:5000.

Conclusion:

Congratulations! You’ve successfully installed Flask in your system and created a basic Flask application.

What is Flask?

Flask is a web application framework written in Python. It was developed by Armin Ronacher, who led a team of international Python enthusiasts called Poocco. Flask is based on the Werkzeg WSGI toolkit and the Jinja2 template engine.Both are Pocco projects.