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2.10 Common mistakes · TheNeuralNetwork

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Zero to Hired AI Engineer/02 Intermediate Python: OOP, Types, Errors & Testing

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earlier chapters

01Python Foundations & Developer Setup

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Intermediate Python: OOP, Types, Errors & Testing

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2.1Classes and objects2.2Dataclasses (you'll use these constantly)2.3Type hints2.4Exceptions and context managers2.5Modules and packages2.6Pythonic code2.7Testing with pytest2.8Code quality2.9Lab walkthrough: Library Management Package2.10Common mistakes2.11Cheat sheet2.12Check your understanding LABAIE-102 · Library lets members borrow forever2.13Week 2 plan, lab and assignment2.14Lab code (reference solutions)2.14.1lab/library/__init__.py2.14.2lab/library/library.py2.14.3lab/library/models.py2.14.4lab/library/storage.py2.14.5lab/tests/test_library.py2.15Week 2 quiz

next chapters

03APIs, HTTP, Async & FastAPI

04Data Handling & SQL

05Math Intuition + Classical Machine Learning

06Deep Learning with PyTorch

07From NLP to Transformers (build a Mini-GPT)

08LLM APIs & Open-Source Models

09Prompt & Context Engineering

10Embeddings & Vector Databases

11RAG End to End (Project 1)

12Advanced RAG, Agentic RAG & RAG Evaluation

13AI Agents from Scratch (no framework)

14LangChain Fundamentals

15LangGraph: Stateful, Controllable Agents

16MCP (Model Context Protocol) + A2A

17Agent Skills (SKILL.md) + Build a Skill-Router Agent

18Multi-Agent Systems

19Evals, Observability, Guardrails & Security

20Fine-Tuning (LoRA/QLoRA) & Inference Serving

21Deployment & LLMOps (Project 3)

22Capstone I: Design & MVP

23Capstone II: Ship, Polish & Demo Day

24Job-Ready: Resume, Interviews & Applications

25Electives: voice, cloud, low-code and vision

26Weekly tracks: DSA + SQL and AI coding tools

02 Intermediate Python: OOP, Types, Errors & Testing/2.10 Common mistakes

§ 2.10section 10 of 20·~2 min

Common mistakes

Mutable default fields in dataclasses (use field(default_factory=list))
Forgetting self as the first method parameter, or forgetting self. when reading an attribute
Tests that depend on each other; each test needs a fresh fixture
Catching Exception and silently passing
Running pytest from the wrong folder and getting ModuleNotFoundError

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