Python, rename files in directory

Question

I have a folder of xlsx files that I want to edit (add columns...) and save with a new name. This code here works but saves in a new directory with same name. How can I modify the second last line of the code to give it an extension to the original name (ie originalname_addtext.xlsx)

from pathlib import Path
from openpyxl import load_workbook

cwd = Path(os.getcwd())
source = cwd / Path('/Users/lidia/Desktop/xlsx/')
dest = cwd / Path('/Users/lidia/Desktop/output/')
for filename in source.glob('*.xlsx'):

.....


wb.save(dest / filename.name) 
wb.close()

Answer 1

Instead of this:

wb.save(dest / filename.name) 

You want this:

wb.save(dest / f'{filename.stem}_addtext{filename.suffix}') 

filename.stem gets you the .name without the suffix (ie '.xlsx')