Update some tarfile.TarFile class attributes to be non-optional

[emontnemery]

Summary

The following tarfile.TarFile attributes are changed to non-optional:

    debug: int
    dereference: bool
    encoding: str
    fileobj: _Fileobj
    format: _TarFormat
    ignore_zeros: bool

References

• fileobj is set unconditionally in the constructor and never cleared:

  • Tip of main when writing this PR: https://github.com/python/cpython/blob/93b27e7f6d185efd5163d04fcdae8436ebf69144/Lib/tarfile.py#L1743-L1758
  • 3.14: https://github.com/python/cpython/blob/360214e25742181c1970fb7cc12e8707638233d2/Lib/tarfile.py#L1744-L1759
  • 3.13: https://github.com/python/cpython/blob/cc1f81bb4577235c99e9a8e6671834c18cc8b304/Lib/tarfile.py#L1733-L1748
  • 3.12: https://github.com/python/cpython/blob/276b9f2ea2da29313619eacfc677e6e907a67889/Lib/tarfile.py#L1712-L1727
  • 3.11: https://github.com/python/cpython/blob/11a1e4e07924089c5fd9987306fa9dbdc78ef56a/Lib/tarfile.py#L1711-L1726
  • 3.10: https://github.com/python/cpython/blob/e3109d6267cb78b534ca22681230dfb06f4c127c/Lib/tarfile.py#L1710-L1725

• debug, dereference, encoding, format, ignore_zeros are all set as class level attributes, and only overwritten as instance attributes if the user passes a non-None override.

  • Setting of class attributes:

    • Tip of main when writing this PR: https://github.com/python/cpython/blob/93b27e7f6d185efd5163d04fcdae8436ebf69144/Lib/tarfile.py#L1701-L1723
    • 3.14: https://github.com/python/cpython/blob/360214e25742181c1970fb7cc12e8707638233d2/Lib/tarfile.py#L1702-L1724
    • 3.13: https://github.com/python/cpython/blob/cc1f81bb4577235c99e9a8e6671834c18cc8b304/Lib/tarfile.py#L1691-L1713
    • 3.12: https://github.com/python/cpython/blob/276b9f2ea2da29313619eacfc677e6e907a67889/Lib/tarfile.py#L1670-L1692
    • 3.11: https://github.com/python/cpython/blob/11a1e4e07924089c5fd9987306fa9dbdc78ef56a/Lib/tarfile.py#L1669-L1691
    • 3.10: https://github.com/python/cpython/blob/e3109d6267cb78b534ca22681230dfb06f4c127c/Lib/tarfile.py#L1668-L1690

  • Overwriting with constructor parameters:

    • Tip of main when writing this PR: https://github.com/python/cpython/blob/93b27e7f6d185efd5163d04fcdae8436ebf69144/Lib/tarfile.py#L1762-L1783
    • 3.14: https://github.com/python/cpython/blob/360214e25742181c1970fb7cc12e8707638233d2/Lib/tarfile.py#L1763-L1784
    • 3.13: https://github.com/python/cpython/blob/cc1f81bb4577235c99e9a8e6671834c18cc8b304/Lib/tarfile.py#L1752-L1773
    • 3.12: https://github.com/python/cpython/blob/276b9f2ea2da29313619eacfc677e6e907a67889/Lib/tarfile.py#L1729-L1750
    • 3.11: https://github.com/python/cpython/blob/11a1e4e07924089c5fd9987306fa9dbdc78ef56a/Lib/tarfile.py#L1728-L1749
    • 3.10: https://github.com/python/cpython/blob/e3109d6267cb78b534ca22681230dfb06f4c127c/Lib/tarfile.py#L1727-L1748

Note:
This is my first PR on this project so I'm not sure about the expectations, let me know if I need to check additional versions supported by typeshed or if the PR should be split up somehow.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

Thanks for checking this thoroughly! (Personally, I would probably have checked the CPython HEAD and the oldest supported version.)