Easy Python Flask Tutorial for Newcomers

Aniket Vaidya — Sat, 27 Sep 2025 21:00:58 +0000

Are you new to web development and want to build your first web application with Python? If yes, then Flask is the perfect place to start! 🎉

Flask is a lightweight and flexible web framework written in Python. Unlike bigger frameworks like Django, Flask keeps things simple and gives you the freedom to build applications your way. In this guide, we’ll walk step by step through setting up Flask and creating your very first web app—even if you’ve never worked with web frameworks before.

🔹 What is Flask?

Flask is a micro web framework in Python. “Micro” means it comes with only the essentials: routing, templating, and server handling. You can add extra features (like database, authentication, etc.) later using extensions.

👉 Think of Flask as a blank canvas—you add the colors (features) you want.

🔹 Installing Flask

Before we start, make sure you have Python 3.x installed.

Create a new project folder, e.g. flask-beginner

Open terminal (or command prompt) in that folder

Install Flask with pip:

pip install flask

Done! ✅

🔹 Your First Flask App

Let’s create a simple “Hello, Flask!” app.

👉 Create a file called app.py and add this code:

from flask import Flask

app = Flask(name)

@app.route("/")

def home():

return "Hello, Flask!"

if name == "main":

app.run(debug=True)

Now run it:

python app.py

You’ll see something like:

Running on http://127.0.0.1:5000/

Open that link in your browser. You should see:

Hello, Flask! 🎉

🔹 Adding Routes

A route is like an address in your app. Let’s add an “About” page.

@app.route("/about")
def about():
return "This is the About Page"

Now visit http://127.0.0.1:5000/about and you’ll see your new page.

🔹 Using HTML Templates

Instead of writing HTML in Python, Flask uses Jinja2 templates.

Create a folder called templates in your project.

Inside it, create a file home.html:

<!DOCTYPE html>

Flask Beginner App

Welcome to Flask!

This page is powered by Flask templates.

Update app.py:

from flask import render_template

@app.route("/")

def home():

return render_template("home.html")

Now refresh your browser. You’ll see your custom HTML 🎨

🔹 Handling Forms

Let’s build a simple form where the user enters their name.

Create a new file inside templates → form.html:

<!DOCTYPE html>

Flask Form

Submit

Update app.py:

from flask import request

@app.route("/form")
def form():
return render_template("form.html")

@app.route("/submit", methods=["POST"])
def submit():
name = request.form["name"]
return f"Hello, {name}!"

👉 Visit http://127.0.0.1:5000/form, type your name, and see Flask greet you.

🔹 What’s Next?

Congratulations 🎉 You’ve just created your first Flask app!

Here are some ideas to continue:

Add more pages with routes and templates

Connect a database (SQLite, MySQL, PostgreSQL)

Learn about Flask extensions (Flask-Login, Flask-WTF, Flask-Mail, etc.)

Deploy your app to Heroku, PythonAnywhere, or Google Cloud

🔹 Final Thoughts

Flask is simple yet powerful. Whether you want to build a small portfolio site, an API backend, or even a full web app, Flask has you covered.

👉 If you found this helpful, share it with friends who are starting out in Python.
👉 Drop your questions in the comments—I’d love to help.

Happy coding 💻✨

Suggested Tags:

python #flask #webdev #beginners #tutorial

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e-mail:- aniketvaidya@gmail.com

DEV Community: Aniket Vaidya

Easy Python Flask Tutorial for Newcomers

Welcome to Flask!

python #flask #webdev #beginners #tutorial