Can you name popular frameworks used for backend application development?

Popular frameworks for backend development in Python:

• Django — a powerful framework with a large set of built-in tools, suitable for creating full-fledged web applications.
• Flask — a lightweight microframework that offers great flexibility in architecture, often used for small services and APIs.
• FastAPI — a modern framework for building APIs with high performance and support for asynchronous programming.
• Tornado — an asynchronous framework well-suited for applications with a large number of concurrent connections.

Example of a simple Flask application:

from flask import Flask
app = Flask(__name__)

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

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