If you need to add a progress bar in a python script, while you slowly loop over some items: before starting creating your own, save your time and consider tqdm.
pip install tqdm
wrap your iterable: tqdm(iterable)
profit!
So for example, something like this:
from tqdm import tqdm for pages in tqdm(mypages[myissue], unit='page'): process_my_page()
You can customize quite a lot of things (like labels, units, position, color, etc) so check the fine manual.
It is THAT simple!