Are you floundering to choose the right Python web development tool? In 2025, Django, Flask, and FastAPI are the hottest names in the assiduity. still, numerous newcomers get stuck on a introductory question: "Is this a library or a frame?" This companion aims to clear that confusion and help you master Inversion of Control (IoC), a core conception of web development. Grounded on my professional experience, I’ll walk you through the pros, cons, and practical operation scripts for each. Table of Contents 1. Library vs. Framework: What is the Difference? 2. Core Concept: Inversion of Control (IoC) 3. The Three Pillars: Django, Flask, and FastAPI 4. Script-Grounded Selection Companion 5. IoC in Action: Practical Law Exemplifications 6. Key Summary 7. Constantly Asked Questions (FAQ) 1. Library vs. Framework: What is the Difference? While both are tools to help you make software, their operation and purpose differ significantly. Library: A collection of functions or classes you c...