Memory error using openpyxl and large data excels

Question

I have written a script which has to read lot of excel files from a folder (around 10,000). This script loads the excel file (some of them has more than 2,000 rows) and read

Answer 1

With recent versions of openpyxl one has to load and read huge source workbook with read_only=True argument, and create / write huge destination workbook with write_only=True mode:

https://openpyxl.readthedocs.io/en/latest/optimized.html