openpyxl
openpyxl is a Python library for reading and writing Excel 2010 xlsx/xlsm/xltx/xltm files. It allows developers to programmatically create, modify, and extract data from Excel spreadsheets without requiring Microsoft Excel to be installed. The library supports features like formulas, charts, images, and cell styling, making it a powerful tool for automating Excel-based workflows.
Developers should learn openpyxl when they need to automate Excel file processing in Python applications, such as generating reports, importing/exporting data, or manipulating spreadsheet data programmatically. It is particularly useful in data analysis, financial applications, and business automation where Excel files are commonly used for data exchange and storage, offering a pure Python solution without external dependencies like COM interfaces.