code4projects

My name is Salvatore and I am a Programmer with 30 years of experience. Code4Projects is the website where I write everything I learn on software programming.

[code4projects @code4projects]

Tests that pass alone and fail together aren't bad luck. They're shared state.

→ Unit vs integration: 0.06s vs 2.65s
→ Mocks for what you can't control
→ yield fixtures that clean up even when a test fails

https://t.co/htasAMeqjS

#Python #pytest

[code4projects @code4projects]

Requirements → domain model → REST API. Not three steps. One flow.

→ Job stories produce domain entities
→ Pydantic v2 enforces domain rules at the HTTP boundary
→ A single error envelope covers every failure path

https://t.co/EdwOFFpYkz

#FastAPI #Python

[code4projects @code4projects]

Asyncio theory is easy. Writing production async code is harder. This article builds a real news aggregator step by step. Each section adds one pattern: gather, TaskGroup, timeout, Semaphore.

https://t.co/747sHOsuoO

Follow @code4projects for more. #Python #asyncio

[code4projects @code4projects]

The GIL means Python threads != parallelism.

- I/O-bound? -> ThreadPoolExecutor
- CPU-bound? -> ProcessPoolExecutor
- 10k+ conn? -> asyncio

Diagrams + runnable code:
https://t.co/VsTYhWAqGM

Follow @code4projects for more.
#Python #asyncio

[code4projects @code4projects]

session.commit() scattered across 10 services is a bug waiting to happen.

The fix: one DatabaseSessionManager that owns commit, rollback, and close. Your services write to the DB �� without ever managing the transaction.
https://t.co/mvWTuuWRiG
Follow @code4projects for more.

[code4projects @code4projects]

print() works until your Python app grows up.

Then you need levels, routing, rotation, and one logging pipeline for app + framework logs.

Loguru makes that much cleaner.
https://t.co/Xlx1NnloFF Follow @code4projects for more. #python #flask

[code4projects @code4projects]

Most Python apps discover config errors at runtime. With pydantic-settings + YAML + env vars, your app either starts with a valid config or doesn't start at all.

No silent failures. No hardcoded secrets. No surprises in prod.

👇 https://t.co/VprIYlU78f

#python #programming

[code4projects @code4projects]

- argparse needs 12 lines to define a single CLI command.
- Click cuts it to 4.
- Typer cuts it to 3 — and your IDE finally understands what types you're passing.

Read the full article here: https://t.co/AnZF9HccZc

[code4projects @code4projects]

https://t.co/i6l8QDkEbE

[code4projects @code4projects]

Launching the Code4Projects newsletter!

Master software engineering by building real projects step by step. 🏗️💻

Subscribe now & get my free eBook: "Getting Started with Docker" 🐳📘

👇 Claim your free guide: https://t.co/GaZpKLRA5C

#software #coding #substack #programming

[code4projects @code4projects]

How to Build an LLM from Scratch (Part 2): Data Sources, Datasets, and Embeddings
https://t.co/nocEgEdvJJ

[code4projects @code4projects]

Designing REST APIs in Practice: A Kubernetes Case Study
https://t.co/gK5FE2Epcr

[code4projects @code4projects]

https://t.co/rSH95rNbyj

[code4projects @code4projects]

What You Call AI Isn’t That Intelligent

What You Call AI Isn’t That Intelligent and Why this is a good thing.

https://t.co/krVo70Vn4v

[code4projects @code4projects]

Crea un Sito Web in HTML e CSS Partendo da Zero.

Video Completo qui: https://t.co/zG0CGEv6hJ

#HTML #CSS #tutorial

[code4projects @code4projects]

Looking to stay ahead of the curve in 2023? Check out this article on the best programming languages to learn! Whether you're a beginner or an expert, there's something for everyone. #programming #javascript #Python #java
https://t.co/W4Wp9YRFvh

[code4projects @code4projects]

Are you a software developer looking for top tools to boost your productivity? Check out these must-have tools for developers on Code4Projects!
https://t.co/QbkQbrvz7B
#softwaredevelopment #productivityhacks #developmenttools

[code4projects @code4projects]

𝐃𝐨𝐧'𝐭 𝐫𝐞𝐢𝐧𝐯𝐞𝐧𝐭 𝐭𝐡𝐞 𝐰𝐡𝐞𝐞𝐥 - out there smarter people have already solved your problems. Put aside your ego, learn from others, and unlock your innovation potential. #programming #innovation #humility #learning #growth

[code4projects @code4projects]

Understanding 𝐁𝐚𝐬𝐢𝐜 𝐂𝐨𝐧𝐜𝐞𝐩𝐭𝐬 of 𝐊𝐮𝐛𝐞𝐫𝐧𝐞𝐭𝐞𝐬 https://t.co/wYlk3NpiYv #kubernetes #k8s #docker

[code4projects @code4projects]

@NaveenS16 @devops Hi Ministry of Cloud,
I created something similar in this project:
https://t.co/QUxNS1MNgE
documented here:
https://t.co/x7iMiwQQvn