File "test-pdf.py", line 7, in <module>
    from PyPDF2 import PdfFileMerger, PdfFileReader
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/site-packages/PyPDF2/__init__.py", line 2, in <module>
    from .merger import PdfFileMerger
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/site-packages/PyPDF2/merger.py", line 33, in <module>
    from .pagerange import PageRange
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/site-packages/PyPDF2/pagerange.py", line 36, in <module>
    class PageRange(object):
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/site-packages/PyPDF2/pagerange.py", line 86, in PageRange
    __init__.__doc__ = __init__.__doc__.format(page_range_help=PAGE_RANGE_HELP)
AttributeError: 'NoneType' object has no attribute 'format'