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Hello world !

 The story of "Hello, World!" is deeply tied to the history of programming and computer science education. Here's a quick rundown of its origins and significance: 1. Origins in Early Programming The phrase "Hello, World!" first appeared in programming literature in the 1970s. It was popularized by Brian Kernighan in his book The C Programming Language (1978), co-authored with Dennis Ritchie , the creator of the C language. However, Kernighan had already used it in an earlier 1972 internal Bell Labs tutorial for the B programming language, a precursor to C. The first recorded "Hello, World!" example in B looked like this: main() { printf("hello, world\n"); } 2. Why "Hello, World!"? Simplicity : It's a small, easy-to-understand program that demonstrates basic syntax. Testing : It's often the first thing programmers write when learning a new language. Debugging : It ensures that the compiler and en...
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Kaggle Tutorial · Data Science in Retail

c Kaggle Tutorial · Data Science in Retail Retail Data Science — From Data to Revenues A complete, hands-on guide to mastering KPIs, forecasting, customer segmentation, and machine learning in retail — using fully synthetic data you can run today. 6 Phases · 3–6 Months · Python + SQL · Portfolio-Ready €€€ Business impact driven by DS 12 Core retail KPIs explained 8 ML use cases with code 5 Portfolio projects to build Introduction Value Chain KPIs ML Use Cases Skills Projects Datasets Roadmap Why This Guide Why Retail is One of the Best Playgrounds for Data Science Retail generates some of the richest, most varied, and most immediately actionable data of any industry. Every pu...
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DevOps · Containers - Docker: A Complete Command Reference

DevOps · Containers Docker — A Complete Command Reference Core concepts, essential commands, choosing the right base image, and a full 3-service Python walkthrough from scratch. 🐳 Docker lets you package any application and its dependencies into a lightweight, portable container that runs identically across every environment — your laptop, a CI server, or a cloud VM. This guide covers everything from the vocabulary to a production-ready multi-service stack. Core Concepts 📦 Image A read-only template built from a Dockerfile. The blueprint for a container. 🚢 Container A running instance of an image. Isolated, ephemeral, and fast to start. 📋 Dockerfile A text file of instructions used to build a custom image layer by layer. 🏪 Registry A storage hub for images. Docker Hub is the default public registry. 🔗 Volume Persistent storage that survives container restarts and removals. 🌐 Ne...
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