Build a Web App with FastAPI: EMI Calculator (Hands-on)

Level up your Python skills by building a real, production-style web application with **FastAPI**—from zero to a working **EMI (Equated Monthly Installment) Calculator** with advanced features. We’ll also use **Cursor** (AI pair-programmer) to accelerate code completion, code generation, and code review—so you experience a modern dev workflow end-to-end. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Why Attend** * Learn where **FastAPI** fits among Python web frameworks (Flask, Django, FastAPI). * See how **Cursor** speeds up development without sacrificing quality. * Build and deploy a **FastAPI** app that calculates EMIs, generates amortization schedules, supports **prepayments**, compares **multiple loans**, and runs **what-if analyses**. * Walk away with a clean, well-structured project you can reuse for your own apps. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **What we'll build** A FastAPI service with endpoints like: * `/emi` – compute monthly EMI for principal, rate, and term * `/schedule` – full amortization schedule (Month, EMI, Principal, Interest, YTD Principal/Interest, Outstanding Balance) * `/prepayments` – schedule and impact of one-time or recurring prepayments * `/compare` – compare two or more loan options side-by-side * `/analysis` – sensitivity analyses (interest rate changes, loan term variations) We’ll return JSON responses and (time permitting) show a minimal HTML or Swagger UI-driven front end for quick testing. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Agenda (compact & hands-on)** 1. **Overview of Python Web Frameworks** – strengths/trade-offs of Flask, Django, FastAPI 2. **Cursor Deep Dive** – code completion, generation, and inline code review 3. **FastAPI Essentials** – routing, pydantic models, validation, typing, docs (OpenAPI/Swagger) 4. **EMI Calculator Domain** – formulas, assumptions, schedule math, prepayment strategies 5. **Live Build** – scaffold the project, implement endpoints, test with docs UI 6. **Advanced Features** – prepayments, loan comparison, sensitivity/term analysis 7. **Packaging & Next Steps** – structure, testing, simple deploy options \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Key takeaways** * A working **FastAPI** project you can run locally. * Clean patterns for request/response models with **pydantic**. * Techniques for **prepayment modeling**, **loan comparisons**, and **sensitivity analysis**. * Practical tips for using **Cursor** effectively (prompts, code review, refactors). \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Who should attend** * Python developers, data/ML engineers, and tech-curious professionals * Beginners to intermediate devs comfortable with basic Python * Product folks wanting to prototype financial calculators quickly \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Prerequisites** * Basic Python (functions, dicts/lists, virtualenvs) * Laptop with: * **Python 3.10+** * **FastAPI** and **Uvicorn** (`pip install fastapi uvicorn pydantic`) * An editor (VS Code or **Cursor** recommended) * (Optional) Git installed \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Format & materials** * Live coding + Q&A * Starter template and final code will be shared during the session * Slides/notes with formulas and endpoint specs included \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Outcomes** By the end, you’ll have: * A modular **EMI Calculator API** with documented endpoints * Full amortization schedules with and without prepayments * Loan comparison outputs and sensitivity/term analysis * A clear roadmap to extend the service or add a front end \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Organizer** **ITVersity – Meetups & Workshops:** Focused, practical sessions to help you ship real projects faster. **Join us** to build something useful—and learn patterns you can reuse in any FastAPI project.