excelsior

pypi link

Just

pip install excelsior-fast

or

uv pip install excelsior-fast

A small project for quickly modifying .xlsx workbooks from Rust or Python. Can be 200+ times faster than openpyxl without openpyxl errors. It consists of two crates:

• rust-core – the core library that works directly with spreadsheet XML.
• python-bindings – Python wrapper built with pyo3 and maturin.

The library lets you append rows or tables, modify individual cells and save the workbook back to disk without loading the entire file into memory.

Example

scanner = Scanner(file_path)
editor = scanner.open_editor(scanner.get_sheets()[0])

editor.append_table_at([[str(k) for k in list(range(50))] for _k in list(range(5))], "B4")
editor.save(out_path)