Bitstring 4.0.0 doesn't work with python 3.7

[alexjacobson95]

First off, thanks for this awesome package, it's a huge help to me. But I wanted to let you know that the latest 4.0.0 release of bitstring seems to have broken 3.7 support. Looks like SupportsIndex doesn't exist in the typing module for python 3.7, and thus errors out on import. I tried bitstring 3.1.9 and had no issues. Example below:

>>> import bitstring
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/mnt/d/Alex/Documents/repos/bitstring/bitstring.py", line 75, in <module>
    from typing import Generator, SupportsIndex, Tuple, Union, List, Iterable, Any, Optional, Iterator, Pattern, Dict,\
ImportError: cannot import name 'SupportsIndex' from 'typing' (/home/alex/.pyenv/versions/3.7.15/lib/python3.7/typing.py)
>>>

Looks like SupportsIndex was added in python 3.8: https://docs.python.org/3.8/library/typing.html#typing.SupportsIndex

[scott-griffiths]

Oops. Looks like my test harness was broken! Thanks for letting me know - I'll fix today.

[scott-griffiths]

Yep, looks like my Python3.7 unit test runner accidentally got upgraded to use Python 3.11. :(

[Bastian-Krause]

@scott-griffiths Do you plan to make a bug fix release for this?

[scott-griffiths]

@Bastian-Krause Yep. Already done. Latest is 4.0.1 which (fingers crossed) should be good this time!

[Bastian-Krause]

@scott-griffiths Thanks a lot!