Remove redundant py2 helper code

[alexander-beedie]

Some long-unnecessary py2 → py3 int and str helper stubs were lurking in the codebase.

These can be removed to clean things up a bit (with the minor/bonus side-effect of making all the isinstance checks that referenced them ~1.5-2x faster, as the helper stubs were both single-element tuples).

[hoxbro]

Thank you!

We vendored datashape this fall as it failed to install with Python 3.12, as it hadn't been updated for some time... That does not mean we should have Python 2 code in it.

I haven't set over the test because #1314 is needed for them to pass. I will set them over when the PR is merged.

[alexander-beedie]

We vendored datashape this fall as it failed to install with Python 3.12, as it hadn't been updated for some time... That does not mean we should have Python 2 code in it.

Makes sense! I was starting to very gently poke around to see what it might take to get first-class Polars integration, and just happened to spot this 🤔

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (077e95c) 85.64% compared to head (2290bb6) 85.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1316      +/-   ##
==========================================
- Coverage   85.64%   85.63%   -0.01%     
==========================================
  Files          52       51       -1     
  Lines       11291    11286       -5     
==========================================
- Hits         9670     9665       -5     
  Misses       1621     1621              

[hoxbro]

Thank you for the PR 👍