If you can write Excel formulas, you can write Python. This is not hyperbole — the mental models are remarkably similar.
Why Make the Switch?
Excel breaks at scale. A 100MB spreadsheet crashes. A Python script processes gigabytes. Excel requires manual updates. Python runs automatically at 6 AM every day.
Your First Script
Start with pandas — it's Excel in code form. read_excel() opens your file. groupby() does pivot tables. merge() replaces VLOOKUP.
Automating Monthly Reports
Imagine a script that downloads your bank statements, categorizes transactions, and emails a P&L summary before your morning coffee. This is not futuristic — it's a 50-line Python script.
Where AI Fits In
With local LLMs, you can ask your spreadsheet questions in plain English. "What was our highest expense category in Q2?" The AI writes the query, executes it, and explains the result.