SyntaxError: invalid syntax

[clach04]

setup.py documents python 2 and 3 support:

• PyPDF3/setup.py

  Line 45 in 727d5a0

  "Programming Language :: Python :: 2",

Change 8691814 introduces F strings which are a python 3.6+ specific feature

• PyPDF3/PyPDF3/generic.py

  Line 494 in 727d5a0

  return NameObject(f"{ss[0]}+{''.join([f'#{c:X}' for c in ss[1].encode()])}")

This breaks support for older python versions, including 3.5.3 (which is the current latest version available for Raspberry Pi's Raspbian).

Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyPDF3 import PdfFileReader
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/root/py/ebook_rename/py35env/lib/python3.5/site-packages/PyPDF3/__init__.py", line 1, in <module>
    from .pdf import PdfFileReader, PdfFileWriter
  File "/root/py/ebook_rename/py35env/lib/python3.5/site-packages/PyPDF3/pdf.py", line 66, in <module>
    from .generic import *
  File "/root/py/ebook_rename/py35env/lib/python3.5/site-packages/PyPDF3/generic.py", line 494
    return NameObject(f"{ss[0]}+{''.join([f'#{c:X}' for c in ss[1].encode()])}")
                                                                              ^
SyntaxError: invalid syntax

Is this a bug or expected? Readme/setup.py would benefit from a update if the later.

[clach04]

Meant to tag @TakamiChie in original report.

[captn3m0]

+1, it would be better setup.py was updated to reflect a Python 3.x requirement.