I have a really large excel file and i need to delete about 20,000 rows, contingent on meeting a simple condition and excel won\'t let me delete such a complex range when us
If you just need to delete the data (rather than 'getting rid of' the row, i.e. it shifts rows) you can try using my module, PyWorkbooks. You can get the most recent version here:
https://sourceforge.net/projects/pyworkbooks/
There is a pdf tutorial to guide you through how to use it. Happy coding!