Python Archives - Page 27 of 27 - ITFROMZERO

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Building a RAG Application with LangChain and Python: From Failure to Production

By IT From Zero February 28, 2026

Six months of hands-on experience building a RAG (Retrieval-Augmented Generation) system with LangChain and Python for an internal document lookup chatbot. From hallucination issues and context window limitations to a solution that actually works in production, with complete code examples.

Integrating ChatGPT API into Web Apps: Real-World Error Handling from Production

By IT From Zero February 28, 2026

Integrating the ChatGPT API into a real web app is more than just a few API calls — you'll hit rate limits, token overflow, and unstable latency the moment you deploy. This post cuts straight to the most common production failures and how to handle them properly from the start.

Database

Getting Started with Redis: Installation and Basic Usage — From 2 AM Production Crisis to Proficiency

By IT From Zero February 28, 2026

When a Django server starts timing out under heavy traffic, the culprit is often a database overwhelmed by repeated identical queries. This guide covers installing Redis on Linux, the essential commands you need to know, and how to integrate a cache layer into Python to immediately reduce database load.

Building a RAG Application with LangChain and Python — A Step-by-Step Guide for Beginners

By IT From Zero February 28, 2026

A step-by-step guide to building a RAG (Retrieval-Augmented Generation) application with LangChain and Python: from loading documents and creating a vector store with Chroma, to building a complete chain that lets your LLM answer questions based on your own data.

Claude API with Python: A Practical Guide to Building AI Applications from A to Z

By IT From Zero February 28, 2026

A hands-on guide to using Claude API (Anthropic) with Python: from your first API call in 5 minutes to streaming, prompt caching, retry logic, and cost control tips from real-world experience.

Building a Custom MCP Server with Python: Connecting AI to Your Systems

By IT From Zero February 27, 2026

MCP (Model Context Protocol) is an open protocol that lets AI models connect to external tools and data sources in a standardized way. This guide walks through building a real-world MCP Server in Python — from installing the SDK and creating secure tools to connecting with Claude Desktop, complete with a full file manager example.

Firecrawl: Web Data Collection for AI Applications When Traditional Scrapers Fall Short

By IT From Zero February 27, 2026

When BeautifulSoup returned "Please enable JavaScript" at 2 AM the night before a deadline, Firecrawl was what saved the entire pipeline. A practical guide to using Firecrawl to collect clean web data for AI and RAG pipelines with Python.