Reference library

System design patterns

Sharding, load balancing, CAP tradeoffs, and scaling patterns — interview and production ready.

1 match
System design patterns medium

How to Structure a Three-Tier Layered Architecture in Python

A mock three-tier architecture with presentation, business, and data layers that process a user request from input to response.

architecture layered design-pattern
Python 
class PresentationLayer:
    def __init__(self, business_layer):
        self.business = business_layer

    def handle_request(self, user_id):
        print(f"[Presentation] Received request for user {user_id}")
        data = self.business.process_user(user_id)
        print(f"[Presentation] Response: {data}")
     …
12 0 Open

Browse by section

Each section groups closely related Python snippets.

System design patterns — Python code examples

What you will find here

This page collects system design patterns snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.