Excel Report Generator

This is a solid automation tool for generating Excel reports from CSVs, databases, or pandas DataFrames using openpyxl and xlsxwriter. It handles the full workflow: data processing, multi-sheet creation, styling headers and cells, adding charts, applying conditional formatting, and even template-based fills. The implementation guide walks through actual code for common patterns like color scales, data validation dropdowns, and auto-adjusting column widths. Best for recurring business reports, data exports, or KPI dashboards where you need formatted spreadsheets without manually opening Excel. The write-only mode optimization for large datasets is a nice touch. It includes practical error handling and troubleshooting for issues like encoding problems and slow generation.