Offline my code works fine, on pythonanywhere, I get the following error:
from PyPDF2 import PdfReader, PdfWriter, PdfMerger
ImportError: cannot import name 'PdfReader' from 'PyPDF2' (/usr/local/lib/python3.10/site-packages/PyPDF2/__init__.py)
PyPDF2 version on pythonanywhere: 1.27.12