# Module 6: LLM APIs (Python)

**CodeVision Python Training**

### **Contents**

  * **Group 1: LLM API Fundamentals** (Sections 6.1-6.5)
  * **Group 2: Building LLM Clients** (Sections 6.6-6.10)
  * **Group 3: Structured Output & Validation** (Sections 6.11-6.15)
  * **Group 4: Reliability & Production Patterns** (Sections 6.16-6.20)

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### **Welcome to Module 6**

This module teaches you **how to work with LLM APIs in Python**, building robust clients that handle real-world challenges like network failures, malformed responses, and rate limits.

It is **practical and code-focused**, showing you how to build production-quality LLM integrations. By the end of this module, you will be able to call LLMs reliably and extract structured data from their responses.

This module builds directly on:

- **Module 1:** Python fundamentals (classes, functions, JSON)
- **Module 3:** LLM Fundamentals (prompting, inference)
- **Module 5:** Embeddings & Vector Databases (retrieval patterns)

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### **What You Will Learn**

| Topic | Why It Matters |
|-------|----------------|
| LLM API architecture | Understand how LLM services work |
| Building HTTP clients | Connect to Ollama, OpenAI, and other APIs |
| Structured output | Get JSON instead of free-form text |
| Response parsing | Handle markdown-wrapped JSON and edge cases |
| Retry with backoff | Handle transient failures gracefully |
| Schema validation | Ensure responses match expected format |
| Rate limiting | Respect API quotas and avoid bans |
| Error handling | Build resilient production systems |

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### **Prerequisites**

Before starting this module, ensure you have:

- Completed Module 1 (Python Foundations)
- Completed Module 3 (LLM Fundamentals)
- Completed Module 5 (Embeddings & Vector Databases)

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### **Module 6 Learning Path**

1. **Content** - Work through the interactive notebook
2. **Quiz** - Test your understanding (auto-graded)
3. **Assessment** - Coding tasks (LLM client, JSON parsing, retry logic, validation) + written explanation (auto-graded)
4. **Resources** - Additional learning materials

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## End of Module 6 Introduction

Click **Content** in the navigation to begin the interactive lesson.
