Writing and Styling Cells

Beyond reading, openpyxl can build spreadsheets from scratch: write values, format cells, and style them so the output looks professional rather than raw.

This lesson covers writing data and applying formatting.

Workbook() creates an empty workbook with one sheet. Grab it with ws = wb.active and optionally rename it via ws.title = 'Report'.

You add more sheets with wb.create_sheet('Details').