XLSX Processing Overview Manipulate Excel files programmatically using openpyxl for rich formatting and pandas for data analysis. This skill covers reading/writing spreadsheets, formulas, charts, conditional formatting, data validation, pivot table generation, CSV import/export, and strategies for handling large files. Apply this skill whenever Excel files need to be created, read, transformed, or enriched through code rather than manual editing. Multi-Phase Process Phase 1: Requirements 1. Determine operation (read, write, transform, report) 2. Identify data sources and volume 3. Define form…