Python script that will apply a double accounting underline to a cell within an existing Excel spreadsheet using the openpyxl library. Openpyxl is a library that allows us to interact with Excel files in Python. It provides a range of tools for reading, writing, manipulating, and formatting Excel data. This makes it a useful tool for data analysis and reporting tasks. If you found this of use to you, please subscribe to our YouTube channel for daily coding content.