Reference library

Production deployment patterns

Graceful shutdown, prod config, rollouts, readiness probes, and ship-with-confidence checks.

1 match
Production deployment patterns medium

Zero Downtime Migration with Dual Write Pattern in Python

Implement a dual-write pattern that writes user data to both legacy and new systems simultaneously to enable zero-downtime migration.

migration dual-write zero-downtime
Python 
from datetime import datetime
import json


class UserService:
    def __init__(self):
        self.legacy_db = {}
        self.new_db = {}
        self.migration_log = []

    def write_user(self, user_id, name, email):
        # Write to new system first
        user_record = {
            "id": user_id,
           …
13 0 Open

Browse by section

Each section groups closely related Python snippets.

Production deployment patterns — Python code examples

What you will find here

This page collects production deployment 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.