How to Apply Conditional Formatting in Excel with Python

In Excel data processing, conditional formatting is a powerful feature that automatically applies different formatting styles based on cell values. It helps quickly identify data patterns, trends, and outliers. This article explains how to use Python to apply conditional formatting in Excel worksheets for effective data visualization. Conditional formatting is widely used in scenarios such as financial reporting, sales monitoring, and performance evaluation. Automating this process through programming can significantly improve efficiency when handling large batches of Excel files. Prerequisites First, install the Spire.XLS for Python library: pip install Spire.XLS This library provides rich Excel manipulation capabilities, including creating, reading, modifying, and converting Excel files—without requiring Microsoft Excel to be installed. Basic Conditional Formatting The core idea of conditional formatting is to automatically change the appearance of cells based on defined rules. The m