In daily data processing workflows, conditional formatting is an extremely practical feature. It automatically applies specific formatting to cells based on their content, helping users quickly identify data patterns, highlight key information, or detect outliers. By automating conditional formatting with Python, data processing efficiency can be significantly improved, especially when handling large datasets or generating reports in batches.

This article demonstrates how to apply various types of conditional formatting in Excel worksheets using Python and the Spire.XLS library, including cell value-based formatting, highlighting duplicate and unique values, data bar visualization, and icon sets.

Environment Setup

First, install the Spire.XLS library:

pip install Spire.XLS

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Once installed, you can start writing code to implement conditional formatting functionality.

Cell Value-Based Conditional Formatting

The most basic type of conditional formatting applies…