Python Web Development

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Web development is a broad term for conceptualizing, creating, deploying, and operating web applications and application programming interfaces for the Web.

Python Use in Web Development

Python can be used to build server-side web applications. While a web framework is not required to build a web application, it is rare that developers would not use an existing open source library to speed up their progress in getting their application working.

Python is not used in a web browser. The language executed in browsers like Chrome, Firefox, and Internet Explorer is JavaScript. Projects such as pyjs can compile from Python to JavaScript. However, most Python developers write their web applications using a combination of Python and JavaScript. Python is executed on the server side while JavaScript is downloaded to the client and executed by the web browser.

To create a website using Python as its programming language, the method is very easy. But keep in mind that previously you must have mastered HTML, CSS and Javascript.

Python Web Frameworks

The most popular and easy-to-learn web development frameworks in python are Django, Flask, and FastAPI.

Flask

Flask is a python microframework that is easy to learn, easy to install and very simple development.

Here are some of its advantages:

easy to use
built-in development server and debugger
integrated unit testing support
restful request dispatching
uses Jinja2 templating
support for secure cookies (client side sessions)
100% WSGI 1.0 compliant
Unicode based
extensively documented

Flask Installation pip install Flask

Hello World Web App with Flask

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
  return "Hello World!"

if __name__ == "__main__":
  app.run()

Run the server with the command: python hello.py

Open http://localhost:5000/ in your browser and Hello World! will appear

Django

Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. It takes care of much of the hassle of Web development, so you can focus on writing your app without needing to reinvent the wheel.

The advantage of the Django Framework compared to others is in terms of scalability. This framework is suitable for large application development.

To install Django execute command below : pip install Django

Once installed, create a new Django project:

django-admin startproject myproject
cd myproject
python manage.py runserver

Open http://127.0.0.1:8000/ in browser and you will see Django welcome page.

FastAPI

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard Python type hints. FastAPI is very popular in 2025 because of its high performance and ease of use.

FastAPI advantages:

Very fast: Performance on par with NodeJS and Go
Fast to code: Increase development speed by 2-3 times
Fewer bugs: Reduce about 40% of human errors
Automatic documentation: Swagger UI and ReDoc automatically available
Standard-based: OpenAPI and JSON Schema

FastAPI Installation: pip install fastapi uvicorn

Hello World with FastAPI:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"Hello": "World"}

@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "q": q}

Run server with command: uvicorn main:app --reload

Open http://127.0.0.1:8000/ to see the result, and http://127.0.0.1:8000/docs for interactive API documentation.

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