How To Create A flask app in Windows

2 min readSep 5, 2024

A. Set Up Your Environment:

Install Python: — Ensure that Python is installed on your machine. You can download it from python.org

2. Create a Project Directory: Create a new directory for your project.

mkdir filename
cd filename

3. Set up a Vertual Environment(Optional but Recomended):

Create a virtual environment:

python -m venv .venv

Activate the virtual environment:

.venv\Scripts\activate

Install Flask within this virtual environment:

pip install Flask

B. Create a flask app:

1. Create the Flask App File: — Create a file named `app.py` in your project directory. This will be the main file of your Flask app:

from flask import Flask

     app = Flask(__name__)

     @app.route('/')
     def home():
         return "Hello, Flask!"

     if __name__ == '__main__':
         app.run(debug=True)

2. Run the Flask App: — In your terminal, while in the project directory, run:

flask --app app run

Flask will start a local development server, and you should see output indicating that the server is running, typically on `http://127.0.0.1:5000/`

3. View in Browser: Open your web browser and go to `http://127.0.0.1:5000/`. You should see “Hello, Flask!” displayed on the page.

C. Developing Your Flask App:

1. Routing: — You can create additional routes in your Flask app by adding more route functions:

@app.route('/about')
     def about():
         return "This is the about page!"

2. Templates: — Flask allows you to use templates to render HTML pages. First, create a `templates` directory in your project and add an HTML file, e.g., `index.html`

html
     <!DOCTYPE html>
     <html lang="en">
     <head>
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <title>Home</title>
     </head>
     <body>
         <h1>{{ title }}</h1>
         <p>Welcome to Flask!</p>
     </body>
     </html>

In your `app.py`, render the template:

from flask import render_template

     @app.route('/')
     def home():
         return render_template('index.html', title="Home")

3. Static Files: — To serve static files like CSS and JavaScript, create a `static` directory in your project and place your files there. You can then link them in your templates:

<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">

4. Deploying Your Flask App: When you’re ready to deploy your Flask app, you can use services like Heroku, AWS Elastic Beanstalk, or Google Cloud Platform.

Your project structure might look like this:

my_flask_app/
│
├── app.py
├── venv/
├── templates/
│   └── index.html
└── static/
    └── style.css

This is a basic introduction to getting started with Flask. From here, you can explore more advanced features like working with databases, handling forms, authentication, and more.

How To Create A flask app in Windows

A. Set Up Your Environment:

B. Create a flask app:

C. Developing Your Flask App:

Your project structure might look like this:

Written by Mohit Malaya Nandy