I think the problem is that #1005 introduced files in a _codecs directory, but the packaging script fails to package subdirectory contents into the .tar.gz and .whl published to PyPI (https://pypi.org ...
PyPDF2 had a lot of contributors since it started with pyPdf in 2005. We are a free software project without any company affiliation. We cannot pay contributors, but we do value their contributions. A ...